C# Library for 64 bit Raspberry Pi OS (aarch64)
| Class | Description |
|---|---|
| Led | A simple red, green, blue, yellow or white led |
| Buzzer.Active | Active buzzer (fixed frequency) |
| Buzzer.Passive | Passive buzzer (variable frequency) |
| Display.Drm | Direct Rendering Manager DRM Display |
| Display.Pcd8544 | PCD8544 also known as Nokia screen |
| Display.Sh1106 | SH1106 Oled 128x64 screen |
| Display.Ssd1351 | SSD1351 Oled 128x128 screen |
| Display.Tm1637 | A 4-digit 7-segment display |
| Adc.Mcp3008 | MCP3008 analog digital converter |
| Button | A debounced button with events |
| UsbWorker | A serial connector for hotplugging Arduinos |
| Info | System information class |
| Sensor.Amg8833 | AMG8833 infrared array sensor |
| Sensor.Ir28khz | A remote control infrared sensor |
| Sender.Ir28khz | A remote control infrared sender |
| Pot.Ds3502 | A digital potentiometer 4.5 - 15.5V, 1mA |
A simple light emitting diode
pin gnd
| ### |
| led |
| ### |
| + | | - |
| + | | |
---- 220Ω ----| ------
Example:
Power on the led connected to pin 11 (put in series to a 220 Ω current limiting resistor and ground) for 1 second.
using Sharpi;
Led led = new Led(11);
Console.WriteLine(led.Description);
led.PowerOn();
Thread.Sleep(1000);
led.PowerOff();Active buzzer with fixed (built in) frequency
gnd ##### pin
| buzzr |
| ##### |
| | | |
------- -------
Example: Beep for one second.
using Sharpi;
Buzzer.Active active = new Buzzer.Active(11);
Console.WriteLine(active.Description);
active.PowerOn();
Thread.Sleep(1000);
active.PowerOff();Passive buzzer with variable frequency
gnd vcc ##### pwm
| | buzzr pin
| | ##### |
| | | | | |
| ------- | | |
-------------- ------
Example:
Play some music on a passive piezo buzzer connected to the PWM0 pin.
using Sharpi;
List<ValueTuple<int, int>> valkyre = new List<(int, int)>()
{
(247, 150), (185, 75), (247, 150), (294, 448), (247, 448),(294, 150), (175, 75), (294, 150),
(370, 448), (294, 448), (370, 150), (294, 75), (370, 150), (440, 448 ), (220, 448), (294, 150),
(220, 75), (294, 150), (370, 732), (175, 150), (294, 150), (175, 75), (294, 150), (370, 448),
(294, 448), (370, 150), (294, 75), (370, 150), (440, 448), (370, 448), (440, 150), (370, 75),
(440, 150), (554, 448), (277, 448), (370, 150), (277, 75), (370, 150), (440, 448)
};
Buzzer.Passive passive = new Buzzer.Passive(0);
Console.WriteLine(passive.Description);
passive.DutyPercent = 50;
passive.PowerOn();
for (int i=0; i< valkyre.Count(); i++)
{
passive.Frequency = valkyre[i].Item1;
Thread.Sleep(valkyre[i].Item2);
}
passive.PowerOff();
passive.Dispose();Direct Rendering Manager DRM Display
If you have the desktop installed on the pi this can only work if your window manager is not claiming the display at the moment.
If the desktop is showing, you need to switch to a virtual terminal. If you are using ssh,
you can change virtual terminal with sudo chvt 1 and back to the desktop
with sudo chvt 7 or you can use a connected keyboard and key combinations ctrl+alt+F1 and ctrl+alt+F7
to do the same.
1920 (variable)
----------------------------------------------------
| | | |
| | | |
| | | |
| | | |
| | | |
| | | | 1080 (variable)
| | | |
| | | |
| | | |
| | | |
| | | |
----------------------------------------------------
Direct Rendering Manager DRM Display
prerequisite:
sudo apt install libdrm-dev
wiring:
connect a monitor (to HDMI)
not working if a window manager is currently claiming the display.
Example:
Output scrolling text with some UTF-8 characters, load and display a test bitmap, measure text for positioning and show the current time with outlined text, draw a test line from top/left to bottom/right.
using Sharpi;
Display.Drm display = new Display.Drm();
Console.WriteLine(display.Description);
Font font = new Font("DejaVu Sans", 250, Font.Edging.antialias);
Bitmap bitmap = display.GetBitmap();
Canvas canvas = new Canvas(bitmap);
Color color = new Color(0, 255, 255);
Paint paint1 = new Paint();
paint1.Color = new Color(255, 255, 255);
Paint paint2 = new Paint()
{
Color = new Color(0, 0, 0),
Stroke = true,
StrokeWidth = 5.0f,
AntiAlias = true
};
display.PowerOn();
canvas.Clear(color);
display.Update();
double fps = 0;
string fpsStr = "";
Stopwatch stopwatchFps = new Stopwatch();
stopwatchFps.Start();
for (uint i = 0; i < 1000; i += 10)
{
fpsStr = $"Aöü: {fps:0.#}";
canvas.Clear(color);
canvas.DrawText(fpsStr, i, 300, font, paint1);
canvas.DrawText(fpsStr, i, 300, font, paint2);
display.Update();
fps = 1000.0f / stopwatchFps.ElapsedMilliseconds;
stopwatchFps.Restart();
}
Thread.Sleep(2000);
Rect rect = font.MeasureText("00:00:00");
float x = (canvas.Width - rect.Width) / 2 - rect.Left;
float y = (canvas.Height - rect.Height) / 2 - rect.Top;
Bitmap testBitmap = new Bitmap("test.png");
DateTime time;
while (!Console.KeyAvailable)
{
time = DateTime.Now;
Thread.Sleep((ushort)(1000 - time.Millisecond));
canvas.Clear(color);
canvas.DrawBitmap(testBitmap, 0, 0);
canvas.DrawText(time.ToString("HH:mm:ss"), x, y, font, paint1);
canvas.DrawText(time.ToString("HH:mm:ss"), x, y, font, paint2);
canvas.DrawLine(0, 0, 1920, 1080, paint1);
display.Update();
}
display.PowerOff();
paint2.Dispose();
paint1.Dispose();
canvas.Dispose();
bitmap.Dispose();
font.Dispose();
display.Dispose();PCD8544 also known as Nokia screen
84
-------------------
| |
| --------------- |
| | | |
| | | | 48
| | | |
| | | |
| --------------- |
-------------------
PCD8544 also known as Nokia screen
config:
edit /boot/config.txt
dtparam=spi=on
wiring:
1 2
3 4
5 6 -- gnd
7 8
gnd -- 9 10
11 12
13 14 -- gnd
vcc -- 15 16 -- dc
17 18 -- rst
din -- 19 20
21 22
clk -- 23 24 -- ce
gnd -- 25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
Example:
Output 'Hello' on the screen using the Nimbus font.
using Sharpi;
Display.Pcd8544 display = new Display.Pcd8544();
Console.WriteLine(display.Description);
Font font = new Font("Nimbus", 20, Font.Edging.alias);
Bitmap bitmap = display.GetBitmap();
Canvas canvas = new Canvas(display.GetBitmap());
Color color = new Color(255, 255, 255);
Paint paint = new Paint();
paint.Color = new Color(0, 0, 0);
display.PowerOn();
canvas.Clear(color);
canvas.DrawText("Hello", 15, 30, font, paint);
display.Update();
Thread.Sleep(5000);
display.PowerOff();
canvas.Dispose();
bitmap.Dispose();
font.Dispose();
display.Dispose();SH1106 Oled 128x64 screen
----------------------------------------------
SH1106 Oled 128x64 screen (I2c)
config:
edit /boot/config.txt
dtparam=i2c_arm=on,i2c_arm_baudrate=400000
wiring:
rpi physical pins
vdd -- 1 2
sda -- 3 4
scl -- 5 6
7 8 -------------
gnd -- 9 10 | | | |
11 12 sda -| | | |
13 14 sck -| | | |
15 16 gnd -| | | |
17 18 vdd -| | | |
19 20 | | | |
21 22 -------------
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
----------------------------------------------
Example:
At the top show a 16x16 pixel logo, the hostname and a voltage indicator. Show cpu temperature, date, time and on the right show an alive animation or a flat line.
using Sharpi;
// load some bitmaps
Bitmap logo =new Bitmap("logo16x16.bmp");
Bitmap[] alive16x16 = new Bitmap[8];
for (int i = 0; i < alive16x16.Count(); i++)
{
alive16x16[i] = new Bitmap($"alive{i}_16x10.bmp");
}
Bitmap flatline = new Bitmap("flatline16x10.bmp");
Bitmap voltage8x12 = new Bitmap("voltage8x12.bmp");
// create display
Display.Sh1106 display = new Display.Sh1106();
Console.WriteLine(display.Description);
display.PowerOn();
Font font = new Font("Libertine", 11, Font.Edging.alias);
Paint paint = new Paint()
{
Color = new Color(255, 255, 255),
};
Bitmap bitmap = display.GetBitmap();
Canvas canvas = new Canvas(bitmap);
Color black = new Color(0, 0, 0);
DateTime Now = DateTime.Now;
int second = Now.Second;
bool[] isAlive = { true, false, true};
bool voltage = true;
string hostname = Info.GetHostname();
int count = 0;
while (!Console.KeyAvailable)
{
Now = DateTime.Now;
if (second != Now.Second)
{
canvas.Clear(black);
canvas.DrawBitmap(logo);
canvas.DrawText("d1", 93, 32, font, paint);
canvas.DrawBitmap(isAlive[0] ? alive16x16[second % 8] : flatline, 112, 20);
canvas.DrawText("d2", 93, 48, font, paint);
canvas.DrawBitmap(isAlive[1] ? alive16x16[second % 8] : flatline, 112, 36);
canvas.DrawText("d3", 93, 64, font, paint);
canvas.DrawBitmap(isAlive[2] ? alive16x16[second % 8] : flatline, 112, 52);
if (voltage)
{
canvas.DrawBitmap(voltage8x12, 116, 0);
}
canvas.DrawText(hostname, 26, 12, font, paint);
canvas.DrawText($"{Math.Round(Info.GetTemperature())}°C", 0, 32, font, paint);
canvas.DrawText(Now.ToString("yyyy-MM-dd"), 0, 48, font, paint);
canvas.DrawText(Now.ToString("HH:mm:ss"), 0, 64, font, paint);
// create 8 screenshots / capture first 8 frames
// to create a gif: ffmpeg -i -framerate 1 screen%02d.png sh1106.gif
if (count < 8)
{
bitmap.EncodeToFile($"./screen{count,2:D2}.png", Bitmap.EncodingFormat.PNG);
count++;
}
display.Update();
second = Now.Second;
}
Thread.Sleep(50);
}
display.Dispose();
for (int i = 0; i < alive16x16.Count(); i++)
{
alive16x16[i].Dispose();
}
flatline.Dispose();
voltage8x12.Dispose();SSD1351 Oled 128x128 screen
128
--------------------
| | | |
| | | |
| | | | 128
| | | |
| | | |
| | | |
--------------------
SSD1351 Oled 128x128 screen
config:
edit /boot/config.txt
dtparam=spi=on
dtoverlay=spi1-1cs (optional for 2nd SPI)
wiring:
_0 for SPI 0 and _1 for SPI 1
3.3v -- 1 2 -- 5v
3 4 -- 5v
5 6 -- gnd
7 8
gnd -- 9 10
11 12 -- cs_1
rst_1 -- 13 14 -- gnd
dc_1 -- 15 16 -- dc_0
17 18 -- rst_0
din_0 -- 19 20
21 22
clk_0 -- 23 24 -- cs_0
gnd -- 25 26
27 28
29 30
31 32
33 34
35 36
37 38 -- din_1
39 40 -- clk_1
Example:
Show a bitmap loaded from a file and scroll the names of available fonts.
using Sharpi;
Console.WriteLine(display.Description);
Font font = new Font("Noto Mono", 20, Font.Edging.alias);
// get the list of font families on the system
List<string> fontNames = Font.Names();
// create a bitmap to draw all fontnames on
Bitmap fontsScrollBitmap = new Bitmap(128, fontNames.Count * 14);
// load a splash bitmap from file
Bitmap splashBitmap = new Bitmap("splash.png");
// create a canvas for the fonts bitmap
Canvas fontsCanvas = new Canvas(fontsScrollBitmap);
Paint fontPaint = new Paint()
{
Color = new Color(0, 255, 255),
};
// draw the font names on the fontCanvas (thereby changing the underlying bitmap)
for (int i = 0, y = 12; i < fontNames.Count; i++, y += 14)
{
using (Font fontFont = new Font(fontNames[i], 12, Font.Edging.alias))
{
fontsCanvas.DrawText(fontNames[i], 0, y, fontFont, fontPaint);
}
}
// get the display's bitmap
Bitmap bitmap = display.GetBitmap();
// create a canvas for the display's bitmap to draw onto it
Canvas canvas = new Canvas(bitmap);
Color black = new Color(0, 0, 0);
display.PowerOn();
// clear screen, draw the splash bitmap, update display
canvas.Clear(black);
canvas.DrawBitmap(splashBitmap);
display.Update();
Thread.Sleep(2000); // or await Task.Delay(2000);
// scroll the fonts bitmap
Rect src = new Rect(0, 0, 128, 128);
Rect dst = new Rect(0, 0, 128, 128);
for (int y=0; y<fontsScrollBitmap.Height- 128; y++)
{
canvas.Clear(black);
src.Top = y;
src.Bottom = y + 128;
canvas.DrawBitmap(fontsScrollBitmap, src, dst);
display.Update();
Thread.Sleep(10);
}
Thread.Sleep(1000);
canvas.Dispose();
bitmap.Dispose();
fontPaint.Dispose();
fontsCanvas.Dispose();
splashBitmap.Dispose();
fontsScrollBitmap.Dispose();
display.Dispose();A 4-digit 7-segment display
_ _ _ _
|_| |_| # |_| |_|
|_| |_| # |_| |_|
TM1637 7 segment LCD Titan Micro Elec.
1 2
3 4
5 6 -- gnd
7 8
gnd -- 9 10
11 12
13 14 -- gnd
vcc -- 15 16 -- dio
17 18 -- clk
19 20
21 22
23 24
gnd -- 25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
supported characters:
":'-0123456789ACEFLOPSbdr°
Example:
Rotate the display 180 degrees, set brightness level, show text.
using Sharpi;
Display.Tm1637 display = new Display.Tm1637();
Console.WriteLine(display.Description);
display.SetRotation(true);
display.SetBrightness(2);
display.SetText("20°C");
Thread.Sleep(1000);
display.SetText("11:30");
Thread.Sleep(1000);
display.SetText("1234");
Thread.Sleep(1000);
display.SetText(" 42");
Thread.Sleep(1000);
display.SetText("42 ");
Thread.Sleep(1000);
display.Dispose();MCP3008 analog to digital converter (resolution 10 bit, 8 channels)
------------------------------------------------------------
MCP3008 8-Channel 10-Bit A/D Converter
Microchip Technology Inc.
config:
edit /boot/config.txt
dtparam=spi=on
dtoverlay=spi1-1cs (optional for SPI 2)
wiring:
rpi physical pins
_0 for SPI 0 and _1 for SPI 1
3.3v -- 1 2 -- 5v
3 4 -- 5v
5 6 -- gnd
7 8
gnd -- 9 10 --__--
11 12 -- cs_1 ch0 -- | o | -- vdd
rst_1 -- 13 14 -- gnd ch1 -- | | -- vref
dc_1 -- 15 16 -- dc_0 ch2 -- | | -- a_gnd
17 18 -- rst_0 ch3 -- | | -- clk
din_0 -- 19 20 ch4 -- | | -- dout
dout_0 -- 21 22 ch5 -- | | -- din
clk_0 -- 23 24 -- cs_0 ch6 -- | | -- cs
gnd -- 25 26 ch7 -- | | -- d_gnd
27 28 ------
29 30
31 32
33 34
35 36
37 38 -- din_1
39 40 -- clk_1
------------------------------------------------------------
Example:
Read from channel 0, output the 10 bit value 0,..,1023 and the voltage corresponding to vref (assumed to be wired to 3.3V)
using Sharpi;
Adc.Mcp3008 mcp3008 = new Adc.Mcp3008();
Console.WriteLine(mcp3008.Description);
Console.WriteLine();
while (!Console.KeyAvailable)
{
Console.CursorTop -= 1;
int value = mcp3008.Read(0);
float volts = 3.3f / 1023 * value;
Console.WriteLine($"Reading {value} from channel 0 <=> {volts}V ");
Thread.Sleep(1000);
}A debounced button with events
useExtResistor = false
pin 3v3
| |
--- push ---
button
useExtResistor = true
gnd pin 3v3
| | |
--- 10kΩ --- --- push ---
resistor button
Example:
Use automatic updates with events and use internal pulldown.
using Sharpi;
void Button_Changed(object sender, Button.EventArgs e)
{
Console.WriteLine($"button on pin {e.Pin} pressed {e.Pressed}");
}
Button button = new Button(8, true);
Console.WriteLine(button.Description);
button.Pressed += Button_Changed;
button.Released += Button_Changed;
while (!Console.KeyAvailable)
{
Thread.Sleep(500);
}
button.Pressed -= Button_Changed;
button.Released -= Button_Changed;
button.Dispose();A serial connector for hotplugging Arduinos
-----------
---------------------- -----| Arduino |
| | | -----------
| Raspberry USB |--- -----------
| USB |---------| Arduino |
| Pi USB |--- -----------
| | | -----------
---------------------- -----| Arduino |
-----------
Example Arduino:
Send ULC in the loop to identify the device, listen to commands "on" or "off", turn on or off the onboard led and send "Led on" / "Led off" accordingly.
#define DEVICEID 1
#define STR_H(x) #x
#define STR(x) STR_H(x)
#define ULC "\xF" STR(DEVICEID) "\xE"
// ------------------------ UsbWorker --------------------------
// 1. set DEVICEID to a unique positive integer value 1, 2,..
//
// 2. prepend your data with ULC or send ULC alone.
//
// example:
// Serial.print(ULC); Serial.println("my data 12345");
// or:
// Serial.println(ULC);
//
// 3. if no ULC is sent within x milliseconds (default 1500)
// the device is considered dead (failure or unplugged)
// -------------------------------------------------------------
void setup()
{
Serial.begin(38400);
pinMode(LED_BUILTIN, OUTPUT);
}
String cmd = "";
void loop()
{
while (Serial.available() > 0)
{
char cmdChar = Serial.read();
if (cmdChar == '\n')
{
if (cmd == "on")
{
digitalWrite(LED_BUILTIN, HIGH);
Serial.print(ULC); Serial.println("Led on");
}
else if (cmd == "off")
{
digitalWrite(LED_BUILTIN, LOW);
Serial.print(ULC); Serial.println("Led off");
}
else
{
Serial.print(ULC); Serial.println("unknown command");
}
cmd="";
}
else
{
cmd += cmdChar;
}
}
Serial.println(ULC);
delay(100);
}
Example:
Add two UsbWorkers, add event handlers and wait for user commands.
using Sharpi;
void UsbWorker_StateChanged(object sender, UsbWorker.StateEventArgs e)
{
Console.WriteLine($"device:{e.DeviceId} state:{e.State.ToString()}");
}
void UsbWorker_NewData(object sender, UsbWorker.DataEventArgs e)
{
Console.WriteLine($"device:{e.DeviceId} data:{e.Data}");
}
UsbWorker usbWorker1 = new UsbWorker(1, UsbWorker.Baud.B38400);
UsbWorker usbWorker2 = new UsbWorker(2, UsbWorker.Baud.B38400);
usbWorker1.StateChanged += UsbWorker_StateChanged;
usbWorker1.NewData += UsbWorker_NewData;
usbWorker2.StateChanged += UsbWorker_StateChanged;
usbWorker2.NewData += UsbWorker_NewData;
Console.WriteLine("- plug in/out devices to test state changes");
Console.WriteLine("- type command and enter: \"on 1\", \"off 1\", \"on 2\", \"off 2\", \"q\"");
string? cmd = "";
while (cmd != "q")
{
if (Console.KeyAvailable)
{
cmd = Console.ReadLine();
if (cmd != null)
{
switch (cmd)
{
case "on 1":
usbWorker1.WriteLine("on");
break;
case "off 1":
usbWorker1.WriteLine("off");
break;
case "on 2":
usbWorker2.WriteLine("on");
break;
case "off 2":
usbWorker2.WriteLine("off");
break;
}
}
}
Thread.Sleep(100);
}
usbWorker1.StateChanged -= UsbWorker_StateChanged;
usbWorker1.NewData -= UsbWorker_NewData;
usbWorker2.StateChanged -= UsbWorker_StateChanged;
usbWorker2.NewData -= UsbWorker_NewData;
usbWorker1.Dispose();
usbWorker2.Dispose();System information class
CPU/GPU/SoC temp: 45.3 °C
CPU/GPU/SoC temp: 113.5 °F
Hostname: raspberrypi
SoC : BCM2835
Model : Raspberry Pi 4 Model B Rev 1.4
Memory:
TOTAL : 3886092.0 KiB (3.0 GiB)
VIRT : 2985496.0 KiB (2915.0 MiB)
RES : 35912.0 KiB
SHR : 29016.0 KiB
PRVT : 6896.0 KiB
Example:
Print temperature, hostname, SoC, revision, serial number and model name to standard output. Additionally output memory information in a loop while producing a test memory leak.
using Sharpi;
float temperature = Info.GetTemperature();
string hostname = Info.GetHostname();
Console.WriteLine($"CPU/GPU/SoC temp: {temperature.ToString("F1")} °C");
Console.WriteLine($"CPU/GPU/SoC temp: {(temperature * 1.8f + 32).ToString("F1")} °F");
Console.WriteLine();
Console.WriteLine($"Hostname: {hostname}");
Console.WriteLine($"SoC : {Info.SoC}");
Console.WriteLine($"Revision: {Info.Revision}");
Console.WriteLine($"Serial : {Info.Serial}");
Console.WriteLine($"Model : {Info.Model}");
Console.WriteLine();
for (int i = 0; i < 6; i++) { Console.WriteLine(); }
while (!Console.KeyAvailable)
{
var memInfo = Info.GetMemoryInfo();
// produce a mem leak for testing
Bitmap memleakdummy = new Bitmap(64, 64);
Console.CursorTop -= 6;
Console.WriteLine("Memory:");
Console.WriteLine($"TOTAL : {memInfo.Total / 1024,10:F1} KiB ({memInfo.Total / (1024 * 1024 * 1024),0:F1} GiB)");
Console.WriteLine($"VIRT : {memInfo.VirtualSize / 1024,10:F1} KiB ({memInfo.VirtualSize / (1024 * 1024),0:F1} MiB)");
Console.WriteLine($"RES : {memInfo.ResidentSize / 1024,10:F1} KiB");
Console.WriteLine($"SHR : {memInfo.ResidentShared / 1024,10:F1} KiB");
Console.WriteLine($"PRVT : {memInfo.ResidentPrivate / 1024,10:F1} KiB");
Thread.Sleep(1000);
}AMG8833 Infrared array sensor also known as Grid-Eye
----------------------------------------------
Amg8833 also known as Grid-Eye
config:
edit /boot/config.txt
dtparam=i2c_arm=on,i2c_arm_baudrate=400000
wiring:
rpi physical pins
vin -- 1 2
sda -- 3 4
scl -- 5 6
7 8
gnd -- 9 10 -------------
(int) -- 11 12 vin -| |
13 14 3v -| --- |
15 16 gnd -| | | |
17 18 sda -| | # | |
19 20 scl -| --- |
21 22 int -| |
23 24 -------------
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
----------------------------------------------
Example 1:
Power on, output description, read thermistor (as temperature), set interrupt high, low and small hysteresis. Read grid temperatures and interrupts and output in a loop. Check if interrupt occured using function and output text if true (also int pin has falling edge in this case).
Thermistor: 22.8125 °C
+ + + + +
+ + + + +
+ + + + +
+ + + + + +
+ + + + + + +
+ + + + + + +
+ + + + + + + +
Interrupt occured
23.25 25.25 24.25 24.75 25.25 25.75 25.25 24.25
21.25 20.55 23.75 26.25 26.75 26.75 26.75 26.75
19.55 20.25 21.55 27.25 27.25 27.75 27.55 27.25
20.75 20.55 24.25 27.75 27.55 28.25 28.25 27.75
25.75 21.55 26.25 28.25 28.75 28.25 28.75 27.55
26.55 23.25 27.25 28.55 28.55 28.55 28.25 27.75
27.55 25.25 28.25 28.25 28.75 28.75 28.55 28.25
28.25 28.25 29.55 28.55 28.75 28.55 28.55 27.75
using Sharpi;
Sensor.Amg8833 amg8833 = new Sensor.Amg8833(0x69);
amg8833.PowerOn(); // 5.6 mA
Console.WriteLine(amg8833.Description);
float thermistor = amg8833.ReadThermistor();
Console.WriteLine($"Thermistor: {thermistor} °C");
Console.WriteLine();
amg8833.SetInterrupt(Sensor.Amg8833.InterruptMode.Absolute, 26, 10, 1);
while (!Console.KeyAvailable)
{
bool[,] ints = amg8833.ReadInterrupts();
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
Console.Write((ints[i, j] ? "+" : " ") + "\t");
}
Console.WriteLine();
}
Console.WriteLine();
if (amg8833.CheckInterrupt()) // alternatively the int pin can be checked for falling edge
{
Console.WriteLine("Interrupt occured");
}
else
{
Console.WriteLine(" ");
}
Console.WriteLine();
float[,] temps = amg8833.ReadTemperatures();
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
Console.Write(temps[i, j] + "\t");
}
Console.WriteLine();
}
Console.CursorTop -= 19;
Thread.Sleep(100);
}
Console.CursorTop += 19;
amg8833.PowerOff(); // 0.55 mA
amg8833.Dispose();Example 2:
Use the Drm Display (HDMI monitor) to output scaled images of the heatmap returned by the sensor until a key is pressed. Finally save a screenshot.
using Sharpi;
Font font = new Font("DejaVu Sans", 42, Font.Edging.antialias);
Paint paint = new Paint { Color = new Color(255, 255, 255) };
Display.Drm display = new Display.Drm();
Bitmap bitmap = display.GetBitmap();
Canvas canvas = new Canvas(bitmap);
display.PowerOn();
Sensor.Amg8833 amg8833 = new Sensor.Amg8833(0x69);
amg8833.PowerOn();
while (!Console.KeyAvailable)
{
Bitmap heatmap = amg8833.ReadHeatMap(20, 30 );
canvas.DrawText("Standard", 50, 50, font, paint);
canvas.DrawBitmap(heatmap, new Rect(0, 0, 7, 7), new Rect(50, 70, 305, 305));
canvas.DrawText("CatmullRom", 400, 50, font, paint);
canvas.DrawBitmap(heatmap, new Rect(0, 0, 7, 7), new Rect(400, 70, 655, 305), Canvas.CubicSampling.CatmullRom);
canvas.DrawText("Mitchell", 750, 50, font, paint);
canvas.DrawBitmap(heatmap, new Rect(0, 0, 7, 7), new Rect(750, 70, 1005, 305), Canvas.CubicSampling.Mitchell);
display.Update();
Thread.Sleep(100);
}
bitmap.EncodeToFile("./screenshot.png", Bitmap.EncodingFormat.PNG);
amg8833.PowerOff();
amg8833.Dispose();
display.PowerOff();
display.Dispose();A remote control infrared sensor
----------------------------------------------
Infrared sensor (receiver module), 38khz
config:
nothing to do
wiring:
rpi physical pins
3.3V -- 1 2
3 4
5 6
7 8 ---------
gnd -- 9 10 | ----- |
(dat) -- 11 12 | | | |
13 14 | ----- |
15 16 ---------
17 18 | | |
19 20 dat gnd 3.3V
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
----------------------------------------------
Example:
Add an event handler, output description, power on and receive NEC codes from a remote control.
0xBF00 0x1A
0xBF00 0x1A
0xBF00 0x1B
0xBF00 0x40
0xBF00 0x42
0xBF00 0x46
0xBF00 0x04
0xBF00 0x04
using Sharpi;
void Sensor_NewNec(object sender, Sensor.Ir28khz.NecEventArgs e)
{
Console.WriteLine($"0x{e.Address,4:X4} 0x{e.Command,2:X2}");
}
Sensor.Ir28khz sensor = new Sensor.Ir28khz(11, true);
sensor.NewNec += Sensor_NewNec;
Console.WriteLine(sensor.Description);
sensor.PowerOn();
while (!Console.KeyAvailable)
{
Thread.Sleep(100);
}
sensor.PowerOff();
sensor.NewNec -= Sensor_NewNec;
sensor.Dispose();A remote control infrared sender using a DIY circuit
Example:
Using Pwm0 and pin 11 (output pin) to send command 0x16 to receiver with address 0xBF00.
using Sharpi;
Sender.Ir28khz sender = new Sender.Ir28khz(0, 11);
Console.WriteLine(sender.Description);
sender.PowerOn();
sender.Send(0xBF00, 0x16);
while (!Console.KeyAvailable)
{
Thread.Sleep(100);
}
sender.PowerOff();A digital potentiometer analog 4.5-15.5V, 1mA
----------------------------------------------
Maxim DS3502
The DS3502 is a 7-bit, nonvolatile (NV)
digital potentiometer (POT) featuring an
output voltage range of up to 15.5V.
Programming is accomplished by an I2C-
compatible interface, which can operate at
speeds of up to 400kHz. External voltages are
applied at the RL and RH inputs to define the
lowest and highest potentiometer outputs.
(10 uSOP package)
I2c slave address adjustable via A0 and A1
A convenient breakout board is available
from Adafruit.
config:
edit /boot/config.txt
dtparam=i2c_arm=on,i2c_arm_baudrate=400000
wiring:
rpi physical pins
vin -- 1 2
sda -- 3 4
scl -- 5 6
7 8
gnd -- 9 10 ----------
(int) -- 11 12 sda -| + |- scl
13 14 gnd -| |- v+
15 16 vcc -| ds3502 |- rl
17 18 a1 -| |- rw
19 20 a0 -| |- rh
21 22 ----------
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
----------------------------------------------
Example:
using Sharpi;
Ds3502 ds3502 = new(0x28);
ds3502.PowerOn();
ds3502.SetWiper(10);
byte test = ds3502.GetWiper();
while(somecondition)
{
// do something
}
ds3502.SetWiperPersistent(10);
ds3502.PowerOff();
ds3502.Dispose();