Raspberry Pi Temperature Controller
Description:
This is a board(plate in Raspberry Pi language) that allows reading the temperature through a thermocouple sensor and controlling 2 external loads such as fans , Peltier coolers or others. it comes with the thermocouple sensor.
WARNING ! High voltages are dangerous and can be deadly . Even though the relays are rated for 250 VAC the relay traces are not isolated .
We do not recommend using the board to command voltages more than 24 volts.
WARNING ! ESD( electrostatic-sensitive device) .
Temperature Range:
Maximum temperature allowed range is : 0 to 819 degrees Celsius (1500 degrees Fahrenheit)
Maximum temperature using the present sensor is 350 degrees Celsius (662 degrees Fahrenheit)
Connecting the temperature sensor (thermocouple )
Connect the sensor + terminal to the board + terminal (the connector on the board that has a big K on it )
Compatibility :
Models A,B, B+ ,2,+2,3
Connections:
This is how the connections with the loads could be done.
Setting up the environment:
These instructions are for Raspbian.
Because it uses the I2C Protocol , we need to enable it .
First install those packages
sudo apt-get install python-smbus
sudo apt-get install i2c-tools
Installation:
1.Please download robogaia_temperature_controller_filtered.tar.gz (it is on the bottom of the page)
There is an older version of the code that does not filter the input temperature
2.Unzip the file:
sudo tar xzvf robogaia_temperature_controller_filtered.tar.gz
3. Go to the uncompressed folder
cd robogaia_temperature_controller_filtered
4.Install the scripts :
sudo ./temperature_controller_install (don't forget the dot and the forward slash )
Usage:
It comes with some example scripts that will allow to read the temperature and control temperature using the relays.
temperature_controller_init #Will initialize the relays . Run this before you use the other scripts.
temp_relay_on cold #Will turn on the cold relay
temp_relay_on hot #Will turn on the hot relay
temp_relay_off cold #Will turn off the cold relay
temp_relay_off hot #Will turn off the hot relay
sudo read_temperature_fahrenheit #Will output the temperature in Fahrenheit
sudo read_temperature_celsius #Will output the temperature in Celsius
temperature_hold #it will read the temperature and try to hold the temperature to the one indicated by the user
#it works in Fahrenheit but by changing a line will work in Celsius
Example:
sudo temperature_hold 80 #it will try to hold the temperature to 80 degrees Fahrenheit
Changing the temperature_hold script to work in Celsius
Open temperature_hold script:
sudo nano /usr/bin/temperature_hold
Change:
#get the temperature form sensor
temperature =get_fahrenheit_val()
#uncomment this for celsius
#temperature = get_celsius_val()
to:
#get the temperature form sensor
#temperature =get_fahrenheit_val()
#uncomment this for celsius
temperature = get_celsius_val()
This is a board(plate in Raspberry Pi language) that allows reading the temperature through a thermocouple sensor and controlling 2 external loads such as fans , Peltier coolers or others. it comes with the thermocouple sensor.
WARNING ! High voltages are dangerous and can be deadly . Even though the relays are rated for 250 VAC the relay traces are not isolated .
We do not recommend using the board to command voltages more than 24 volts.
WARNING ! ESD( electrostatic-sensitive device) .
Temperature Range:
Maximum temperature allowed range is : 0 to 819 degrees Celsius (1500 degrees Fahrenheit)
Maximum temperature using the present sensor is 350 degrees Celsius (662 degrees Fahrenheit)
Connecting the temperature sensor (thermocouple )
Connect the sensor + terminal to the board + terminal (the connector on the board that has a big K on it )
Compatibility :
Models A,B, B+ ,2,+2,3
Connections:
This is how the connections with the loads could be done.
Setting up the environment:
These instructions are for Raspbian.
Because it uses the I2C Protocol , we need to enable it .
First install those packages
sudo apt-get install python-smbus
sudo apt-get install i2c-tools
Installation:
1.Please download robogaia_temperature_controller_filtered.tar.gz (it is on the bottom of the page)
There is an older version of the code that does not filter the input temperature
2.Unzip the file:
sudo tar xzvf robogaia_temperature_controller_filtered.tar.gz
3. Go to the uncompressed folder
cd robogaia_temperature_controller_filtered
4.Install the scripts :
sudo ./temperature_controller_install (don't forget the dot and the forward slash )
Usage:
It comes with some example scripts that will allow to read the temperature and control temperature using the relays.
temperature_controller_init #Will initialize the relays . Run this before you use the other scripts.
temp_relay_on cold #Will turn on the cold relay
temp_relay_on hot #Will turn on the hot relay
temp_relay_off cold #Will turn off the cold relay
temp_relay_off hot #Will turn off the hot relay
sudo read_temperature_fahrenheit #Will output the temperature in Fahrenheit
sudo read_temperature_celsius #Will output the temperature in Celsius
temperature_hold #it will read the temperature and try to hold the temperature to the one indicated by the user
#it works in Fahrenheit but by changing a line will work in Celsius
Example:
sudo temperature_hold 80 #it will try to hold the temperature to 80 degrees Fahrenheit
Changing the temperature_hold script to work in Celsius
Open temperature_hold script:
sudo nano /usr/bin/temperature_hold
Change:
#get the temperature form sensor
temperature =get_fahrenheit_val()
#uncomment this for celsius
#temperature = get_celsius_val()
to:
#get the temperature form sensor
#temperature =get_fahrenheit_val()
#uncomment this for celsius
temperature = get_celsius_val()
Also you might like the Raspberry Pi Dual Thermocouple Plate
Code and datasheets :
| raspberry_pi_temperature_controller_plate_schematics.pdf |
Source code and example code:
| robogaia_temperature_controller_filtered.tar.gz |
| robogaia_temperature_controller.tar.gz |