homlet devices

DIY devices for homlet.

Jeenode

Jeenode design by JC Wippler: http://jeelabs.net/projects/hardware/wiki/JeeNode

References

• http://jeelabs.net/projects/hardware/wiki/JeeNode
• http://jeelabs.org/2011/12/13/developing-a-low-power-sketch/
• http://jeelabs.org/2011/06/09/rf12-packet-format-and-design/
• http://jeelabs.org/2011/01/14/nodes-addresses-and-interference/
• http://jeelabs.org/2010/12/07/binary-packet-decoding/
• http://jeelabs.org/2010/12/08/binary-packet-decoding-–-part-2/
• http://jeelabs.org/2013/09/05/decoding-bit-fields/
• http://jeelabs.org/2013/09/06/decoding-bit-fields-part-2/

TinyTX

TinyTX design by Nathan Chantrell: https://web.archive.org/web/20200925223440/https://nathan.chantrell.net/tinytx-wireless-sensor/

Setup

Arduino IDE Setup (on my Mac):

• Install OneWire lib into ~/Documents/Arduino/libraries/OneWire/
• Fix OneWire lib - Open OneWire.h and below the line:

      #include “Arduino.h”       // for delayMicroseconds, digitalPinToBitMask, etc

add:

      #include “pins_arduino.h”  // for digitalPinToBitMask, etc

• Install DallasTemperature lib into ~/Documents/Arduino/libraries/DallasTemperature/
• Install Jeelib into ~/Documents/Arduino/libraries/jeelib/

Programmer setup:

• Use an ISP USB programmer
• Setup an ISP adapter: http://www.evilmadscientist.com/2007/using-avr-microcontrollers-minimalist-target-boards/

Program ATTiny84:

• Setup ATTiny support in Arduino thanks to: http://code.google.com/p/arduino-tiny
• Select Tools/Board > ATtiny84 @ 8Mhz (internal oscillator; BOD disabled)
• Select Tools/Programmer/USBasp
• Select Tools/Burn Bootloader. Note that this isn’t actually burning a bootloader to the ATtiny (it doesn’t use one), it is just using this function to set the AVR fuses to configure the oscillator at 8MHz.
• Upload a TinyTX_* sketch

Build circuit:

• You can try on a stripboard with: http://nathan.chantrell.net/downloads/arduino/tinytx/tinytx_stripboard_ds18b20.png
• You can too order PCBs from SeeedStudio as explained here: http://nathan.chantrell.net/tinytx-wireless-sensor/#div-comment-190398

Issues:

• If the sketch is stuck during call to rf12_sendWait then Burn Bootloader to fix the issue

References

• https://github.com/nathanchantrell/TinyTX/blob/master/TinyTX_DHT22/TinyTX_DHT22.ino
• https://github.com/mharizanov/TinySensor/blob/master/Funky_DHT22/Funky_DHT22.ino