LCC Requirements

The Lizard Climate Control system has these requirements (updated as they change):

  • turn lights and heaters on/off at specified times
  • maintain specified temperatures during day and night
  • report current temperature/humidity both locally (at cage) and remotely via internet
  • manual bypass of Arduino control of AC switches
  • built in fail-safe for over temperature situations
  • protect sensors from lizard and other in-cage hazards
  • visual indication of temperature situation (green=good, red=bad etc)
  • document it!


TMP36 Analog Temperature Sensor

The TMP36 was my first sensor and is pretty simple. 3 pins, 1 analog port.

Available from SparkFun.

It’s a low voltage temperature sensor. It provides a voltage output that is linearly proportional to the Celsius temperature. It also doesn’t require any external calibration to provide a typical accuracy of ±1°C at +25°C and ±2°C over the −40°C to +125°C temperature range. Give the it a ground and 2.7 to 5.5 VDC and read the voltage on the Vout pin. The output voltage can be converted to temperature easily using the scale factor of 10 mV/°C. For Example:

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Tri-Temp Project Intro


This is the Tri-Temp project. It comes in two flavors- Standard and Ethernet. The Standard version outputs all readings on an LCD. The Ethernet adds output to HTML via a web browser. I did not design this to use an Ethernet shield- only the Arduino Ethernet- it’s more compact.So what’s this all about? Reading the Temp and Humidity! Nothing special going on here, just reading the digital data from three DHT22 sensors and displaying it.

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My Arduino Goals for 2012…

This is what I’m hoping to get accomplished….

  • Temp, Pressure, Humidity monitor for the house with stats by Cacti. Ethernet Arduino required!
  • Cat food dispense- dispense 1 cup daily, possibly allow cat to initiate dispensing up to 1 cup limit.
  • Shower timer- time showers by listening to the water noise
  • Power monitor- find a way to monitor power usage either by outlet or at the fuse box. I know there are solutions but they’re expensive and non-hackable…
  • Weather station that updates to the internet- biggest hurdle here is parts…
  • RFID door locks
  • PC hardware monitor…I want to log the various temps on my machine but sadly all the sensors aren’t accessible via software. I hate writing windows software so this could be a creative way to do it.