ideas:temp_management
RFM69HW Temp Management
Idea 1: Crystal Oven
Components
RFM69HW
Moteino or another micro
2 Resistors (10ohms)
Mosfet
Design
2 resistors in parallel lying over the RFM69HW crystal acting as heaters
Mosfet is used to connect the resistors to ground (they are connected to VCC as well) to complete the circuit and heat up the crystal.
To control the temperature we use PWM to turn the mosfet on and off, the hotter we want the more often we turn the mosfet on.
The control system uses a PID loop
Current Implementation
Using the PID v1 library on the arduino (using a moteino)
Measuring temperature with the onboard RFM69HW temperature sensor
Working well using a setpoint of 20C to test.
Possible Improvements
Idea 2: Adjust Freq to Temp
Links
Experiments
This section is more for documentation.
Temperature Drift
ideas/temp_management.txt · Last modified: 2020/06/27 23:02 (external edit)