electronics

Various electronics related notes, projects and schematics

Debian setup

$ sudo usermod -aG dialout $(whoami) && sudo chmod a+rw /dev/ttyUSB0.
$ sudo apt install -y avrdude
$ sudo avrdude -v -v -P /dev/ttyUSB0 -c avrisp -p t85

Drivers for ch340

esp-wroom32

$ lsusb
Bus 001 Device 005: ID 10c4:ea60 Silicon Labs CP210x UART Bridge

MacOS

upload_protocol = arduino
upload_port = /dev/cu.usbserial-1140
monitor_port = /dev/cu.usbserial-1140

brew install minicom for the serial console monitor: minicom -D /dev/cu.usbserial-14310 / ch340g (esp8266) / CP210x (esp32)

airrohr esp8266:

      +-o USB2.0-Serial@14410000  <class AppleUSBDevice, id 0x100009ab2, registered, matched, active, busy 0 (1 ms), retain 15>

airrohr

Arduino boards

Arduino Pro Mini atmega328 Board 5V 16M Compatible Nano @ 16 MHz

platformio: Arduino Pro or Pro Mini ATmega328 (5V, 16 MHz) (pro16MHzatmega328)

LED: 13. There is a built-in LED connected to digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.

Using USB2TT_004 converter to program (RX/TX pins needs to be crossed):

# avrdude -v -v -p m328p -n  -c arduino -P /dev/ttyUSB0  -b 57600 2>&1  | tail  -n12
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: lfuse reads as 0
avrdude: safemode: hfuse reads as 0
avrdude: safemode: efuse reads as 0

avrdude: safemode: lfuse reads as 0
avrdude: safemode: hfuse reads as 0
avrdude: safemode: efuse reads as 0
avrdude: safemode: Fuses OK (E:00, H:00, L:00)

avrdude done.  Thank you.

platformio.ini

[env:pro16MHzatmega328]
platform = atmelavr
board = pro16MHzatmega328
framework = arduino
board_build.f_cpu = 16000000L

; Serial Monitor options
monitor_speed = 115200

; avrdude  -c foo
upload_protocol = arduino
upload_port = /dev/ttyUSB0

Remember to press RESET button on the board before starting the upload. When the IDE is waiting for the programming to start, release the RESET button.

Fuse bits - external clock

Arduino: select Arduino Nano as board and ATmega328P (old bootloader) as processor. This will force slower baud rate when programming.

Mini ATTINY85 Micro USB Development Board for Digispark Kickstarter

https://www.electroschematics.com/learn-to-use-attiny85-usb-mini-development-board/

# avrdude -v -v -c usbasp-clone -p t85 -n 2>&1 | tail  -n12
avrdude: Device signature = 0x1e930b (probably t85)
avrdude: safemode: lfuse reads as E1
avrdude: safemode: hfuse reads as DD
avrdude: safemode: efuse reads as FE

avrdude: safemode: lfuse reads as E1
avrdude: safemode: hfuse reads as DD
avrdude: safemode: efuse reads as FE
avrdude: safemode: Fuses OK (E:FE, H:DD, L:E1)

avrdude done.  Thank you.

Fuse bits

After burning bootloader:

avrdude: Device signature = 0x1e930b (probably t85)
avrdude: safemode: lfuse reads as 62
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FF

avrdude: safemode: lfuse reads as 62
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FF
avrdude: safemode: Fuses OK (E:FF, H:DF, L:62)

Fuse bits - internal 8 MHz clock, divided internally by 1 MHz

Board manager URLs:

http://digistump.com/package_digistump_index.json
https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json

Blink:

void setup() {
 pinMode(1, OUTPUT);
}


void loop() {
  while(1) {
   digitalWrite(1, HIGH);
   delay(200);
   digitalWrite(1, LOW);
   delay(200);
  }
}

https://electronics.stackexchange.com/a/216233 - Arduino programming directly via USB

Arduino programmers

USB2TT_CO4 from homsun-ic.com

$ sudo modprobe ch341

$ sudo dmesg -H
...
[  +0,149280] usb 1-2: New USB device found, idVendor=1a86, idProduct=7523, bcdDevice= 2.64
[  +0,000006] usb 1-2: New USB device strings: Mfr=0, Product=2, SerialNumber=0
[  +0,000003] usb 1-2: Product: USB Serial
[  +0,001315] ch341 1-2:1.0: ch341-uart converter detected
[  +0,000505] usb 1-2: ch341-uart converter now attached to ttyUSB0

$ sudo -i
# cat /dev/urandom > /dev/ttyUSB0

# the led should blink

Connect:

     usb2ttl    arduino pro mini
     GND <--------> GND
     RXD <--------> TXD
     TXD <--------> RXD
     5V  <--------> VCC

USBasp

[kwi15 14:36] usb 1-1: new low-speed USB device number 51 using xhci_hcd
[  +0,154185] usb 1-1: New USB device found, idVendor=16c0, idProduct=05dc, bcdDevice= 1.02
[  +0,000007] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  +0,000003] usb 1-1: Product: USBasp
[  +0,000003] usb 1-1: Manufacturer: www.fischl.de

ESP8266 NodeMCU Pinout

VV pin provides 5V from USB port
D0 pin (GPIO16) maps to pin 16 in Arduino
for SPI use GPIO12, 13 and 14 - https://arduino-esp8266.readthedocs.io/en/2.4.0-rc1/libraries.html#spi

platformio.ini

[env:nodemcuv2]
platform = espressif8266
board = nodemcuv2
framework = arduino
upload_speed = 2000000
upload_port = /dev/ttyUSB0
monitor_port = /dev/ttyUSB0
monitor_speed = 115200
lib_deps = 
        adafruit/DHT sensor library@^1.4.1
        adafruit/Adafruit Unified Sensor@^1.1.4
        jfturcot/SimpleTimer@0.0.0-alpha+sha.b30890b8f7
build_flags = 
        -DDEBUG_ESP_PORT=Serial
        -DDEBUG_ESP_HTTP_CLIENT
        -DDEBUG_ESP_HTTP_SERVER
        -DDEBUG_ESP_CORE
        -DDEBUG_ESP_WIFI

ATTINY85 - DIGISPARK REV.3

https://docs.platformio.org/en/latest/boards/atmelavr/digispark-tiny.html

Update platformio before programming the device (PIO Home > Updates > Update all).

[env:digispark-tiny]
platform = atmelavr
board = digispark-tiny

; change microcontroller
board_build.mcu = attiny85

; change MCU frequency
board_build.f_cpu = 16000000L

; via external UART/USB converter
monitor_port = /dev/ttyUSB0
monitor_speed = 9600

lib_deps = featherfly/SoftwareSerial@^1.0

macbre / electronics