jscrane/tinysensors

Environmental sensors with ATtiny84, nrf24l01+ and Raspberry Pi

View this project on CADLAB.io.

TinySensors

See blog articles.

• hub: lightweight Raspberry Pi server-side for TinySensor
• sensing: Database viewer
• eagle: TinySensor Eagle project

Software

• Arduino

  • IDE version 1.8.9 or uC-Makefile
  • ATtiny core
  • nRF24 library
  • DHT22 library, slimmed-down for ATtiny

• Raspberry-Pi

  • Tested on Raspberry Pi 2, Pi 3 Model B and Pi Zero-W
  • nRF24 library
  • BCM2835 library
  • libmosquitto-dev
  • lcdproc

• Viewer

  • Leiningen v2.0, or
  • IntelliJ with the Cursive plugin

tinysensors's Issues

Tinysensor sketch improvements

• remove pinMode for A1 (not needed)
• remove setAutoAck (not needed)
• constants for ports
• pinMode(A1, INPUT_PULLUP)
• fix sensortest sketch
• setMaxRetries (to save batteries) --- use sensortest
• use Interrupted instead of sleepy

New Tinysensor layout for Optiboot

lcd_weather updates

• scroller for current description
• rainfall omitted if none
• min omitted if none
• lcdproc server from command-line

improve rf24 bridge functionality

Network with just sensors and esp8266 bridge:

• bridge web-config manages sensor id->name mapping
• bridge sends sensor messages to external MQTT server
• Pi provides MQTT server and manages external display

Sleep longer when humidity is high

Notice that battery life is significantly worse when humidity is high. Think this is down to 2.4GHz absorption by water molecules.

Test this by sleeping for longer, e.g., 20 mins instead of 5 when humidity is, e.g., > 75%

EEMEM

#include <avr/eeprom.h>

#if defined(NODE_ID)
uint8_t eeprom[] EEMEM = {NODE_ID};
#endif

Could maybe use this trick for retries too?

systemd unit files

individual units for programs in /usr/local/bin

Board layout for raspberry pi

Clock ATtiny at 1MHz

This will require a new patched optiboot. The current patch assumes the frequency is 8MHz.

See optiboot/bootloaders/optiboot/Makefile.extras.

investigate nRF24

nRF24 looks interesting.

mqtt-tft graphing sketch

• multiple graphs (current value, sprite)
• switching between graphs
• sensor labels name -> colours
• current graph title
• configuring individual graphs
• 4-bit colour depth
• graph config: min, max, refresh interval
• const strings in flash

cleanup socket handling

Fix mux in same way as lcd in commit 83f410c

Boards.txt entry for ATTiny44

mux should be more robust

When one of its dependencies dies, mux dies too. This isn't so good because all of the other services depend on it.

It should be more robust, like lcd.

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