FutureKit Temperature Controller

I bought this figuring it looked like a fun board to reprogram if I did not use it as a temperature controller. I don't see any source code floating around the Internet for it, so I will create some. :-)

First I thought I'd try it out in its stock form. Then I packed and moved from Oregon to California and lost the ATmega8 microcontroller! I am sure it's one of my storage bins! But coding is more fun that searching bins...

Here is the data sheet for this kit.

This is an approximately 8x10cm card with a large 4 digit red LED display, 5 push buttons, relay, LED, two 3 pin headers to connect temperature sensors via 3 wire ribbon, and a 7806 6vdc regulator. (6 volt? really? There is a diode inline that drops it below the 5.5vmax for the CPU.)

Board input power is spec'ed at 12vdc, so that the 12v relay can fire. I bet it would work down to the dropout of the voltage regulator, which must be around 8 volts. High voltage input is determined by other components (like electrolytic caps) but should be fine up to about 14vdc.

I am upgrading to an ATmega328P microcontroller to make it more compatible with my shiny new Arduino Uno. It will drop right in. I bought a replacement along with a USB tiny ISP programmer from Sparkfun; this board has pads for a 6 pin inline header that taps into the ICSP lines so I can reprogram the controller in situ.

Sensors are one-wire DS18B20 https://www.sparkfun.com/products/245

7 segment LED display: port D0-D7 control the segments:

PD0 g
PD1 c
PD2 d
PD3 e
PD4 dt
PD5 b
PD6 f
PD7 a

port PB0,PC3,PC4,PC5 select the digit

PC5 1 (numbered left to right)
PC4 2
PC3 3
PB0 4

Push buttons are on

1 PB3 (MOSI)
2 PB4 (MISO)
3 PB5 (SCK)
4 PD7 (shared with 7-seg segment 'a')
5 PD6 (shared with 'f')

Relay is on C0

Sensor #1 is on port B1 optional sensor #2 is on port B2

There is a programming port 1x6

1 RST
2 GND
3 MOSI
4 MISO
5 SCK
6 +5V

There is a 2x3 port, undocumented. These could be used to connect potentiometers or some other analog sensor (light sensor? PIR?)

PC1 (ADC1/PCINT9)  1  6  PC2 (ADC2/PCINT10)
              GND  2  5  GND
              +12V 3  4  +12V