!!! PLEASE check the newer version apricot !!!

purpose

This is the software used for my forgetmenot board based on ATtiny3217 (alternative ATtiny1617, ATtiny817). See hardware. The board can:

• measure temperature on chip / board / humidity sensor
• measure soil humidity
• send/receive data via RFM69 to gateway
• send data via RFM95 (abp mode)
• send data via RFM95 (otaa mode)
• notify via LED's
• control a motor via bridge
• output data on ST7735 / SSD1306
• handle touch sensor (short/long press)
• read hall sensor (magnetic switch)
• measure battery voltage
• sleep
• debug output to serial (input is not possible on this version of the board)
• BOD (brown-out detector) on low voltages

This is a complete new version of a sensor based on the ATtiny88.

installation

pyenv virtualenv 3.7.8 forgetmenot
pyenv local forgetmenot
pip install -r requirements
./activate.py node
make build port=3

directory structure

• examples: many examples
• node: main sensor project
• common: commonly used "libraries"

To upload one of the examples or node:

./activate.py examples/blink
make build port=3

serial output

You can connect the usb of your computer to the usb and run

make serial port=1

available ports

Depending on where you connect the device on your computer it has a different port number. You can find out the number by running the following command:

make ports

useful links

• no support megatinycores on pio yet: platformio/platform-atmelavr#83 (comment)

programmer

• with simple ttl serial port: https://github.com/mraardvark/pyupdi
• https://github.com/SpenceKonde/megaTinyCore

todos

• use cs on st7789 w/o CS: Bodmer/TFT_eSPI#163 (comment)
• decoupling caps: https://electronics.stackexchange.com/questions/90971/does-my-circuit-need-decoupling-caps
• use PTC (capacitive touch control) see http://ww1.microchip.com/downloads/en/appnotes/atmel-42360-ptc-robustness-design-guide_applicationnote_at09363.pdf

toolchains for avr-gcc / avrxmega3

I tried many things including patching etc. At the end 2 options worked. You can configure them in the Makefile. I have markr42 active by default.

1. toolchain_microchip

• download the newest toolchain from microchip with a patch
• download pack from atmel (search for attiny3217 to get the correct pack)

mkdir toolchain_microchip
tar xfz avr8-gnu-toolchain-osx-3.6.2.503-darwin.any.x86_64.tar.gz -C toolchai_microchip/ 
make patch_toolchain_microchip

mkdir toolchain_microchip/pack
unzip Atmel.ATtiny_DFP.1.4.283.atpack -d toolchain_microchip/pack/

2. toolchain_markr42 (more info) I just adapted it to have the binaries locally installed and not in /usr/local/avr (that's what the patch is for)

mkdir toolchain_markr42
cd toolchain_markr42
brew install automake
wget https://github.com/MarkR42/robotbits/raw/master/avr_toolchain/build.sh
wget https://github.com/MarkR42/robotbits/raw/master/avr_toolchain/avr-xmega3.patch.bz
make patch_toolchain_markr42