ericklein / transmitter_TX_RAW

transmitter

What is receiver?

Simple packet communication between 900mhz radios. reciever is half of the solution, the other half is in the transmitter application.

Purpose

Validate simple package transmission and reception for inclusion in other solutions

Software Dependencies

• uses Radiohead http://www.airspayce.com/mikem/arduino/RadioHead/RadioHead-1.100.zip
  • adfruit maintains a GitHub branch at https://github.com/adafruit/RadioHead
• uses Adafruit_LiquidCrystal https://github.com/adafruit/Adafruit_LiquidCrystal

BOM

• 1X: Adafruit Arduino Pro Mini 328 - 5V (part 2378)
• 1X: Adafruit FRM69HCW Radio Breakout (part 3070)
• 1X: Adafruit FTDI Friend (part 284)
• [optional]1X: 16x2 LCD panel
• [optional]1X: Adafruit i2c character LCD backpack (part 292)
• 1 protoboard
• wire

Pinouts

• see Fritzing diagram
• Pro A4 (SDA) for LCD backpack
• Pro A5 (SLC) for LCD backpack

Information Sources

- Adafruit RFM69HCW (SPI): https://learn.adafruit.com/adafruit-rfm69hcw-and-rfm96-rfm95-rfm98-lora-packet-padio-breakouts?view=all
- Sparkfun RFM69HCW: https://learn.sparkfun.com/tutorials/rfm69hcw-hookup-guide/all
- Adafruit i2c/SPI LCD Backpack: https://learn.adafruit.com/i2c-spi-lcd-backpack/
- Radiohead main page: https://www.airspayce.com/mikem/arduino/RadioHead/index.html
- 16x2 LCD panels: http://oomlout.com/parts/LCDD-01-guide.pdf

Issues

• 041719: code will shit a brick after 7 digit packet #
• 040620: displayMessage will leave visual artifacts if message string decreases in size

Questions

- 041719: Why am I counting packets?
- 041719: surprised iota isn't having a problem with arg3
- 041719: do I buffer overrun or truncate when inbound packet is larger than defined buffer len?
- 041719: looks like the code only waits 500ms (move to variable?) then just pushes another packet, should code replies with receiver.packetpush# to see if they packets fall far out of sync?
- 041719: see datagram example, one of these is wrong? Why are we constantly resetting buf, len in loop?

Learnings

Feature Requests

Revisions

- 010318: first version, adapted from adapted from RadioHead69_RawDemo_TX
- 040620: [FR 010318] move serial debug code to conditional compile
- 040620: [FR 010318] display error conditions on LCD display
- 040620: Github checkin