969 PI-Based Fan Controller
969 : PI-Based Fan Controller
- Author: Dominik Brandstetter
- Description: Temperature Based Fan Speed Controller
- GitHub repository
- Clock: 1000000 Hz
How it works
This project involves reading a 4-bit ADC value through a dedicated interface. Another a 4-bit interface allows the user to set the desired target value. The integrated controller, designed with fixed parameters, regulates the fan speed through a PWM (Pulse Width Modulation) output operating at approximately 25 kHz. The controller maintains a minimum duty cycle of around 20%, and it has the capability to increase this value up to 100%. The output consists of a signed 4-bit controller value along with the corresponding PWM signal. Additionally, the current controller value can be read from the 7-Segment-Display. This configuration ensures precise control and adjustment of the fan speed based on the input parameters provided through the 4-bit interfaces, with the added feature of fixed controller parameters for simplicity and stability.
How to test
After reset, the fan controller should initiate operation, adjusting the fan speed based on the setpoint and ADC value. The PWM output, set at approximately 25 kHz, regulates the fan speed.
External hardware
4-Bit ADC, LED display, Fan
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | ADC_BIT_0 | segment_a | Controller_SET_BIT_0 |
| 1 | ADC_BIT_1 | segment_b | Controller_SET_BIT_1 |
| 2 | ADC_BIT_2 | segment_c | Controller_SET_BIT_2 |
| 3 | ADC_BIT_3 | segment_d | Controller_SET_BIT_3 |
| 4 | SET_BIT_0 | segment_e | Controller_SIGN_BIT_4 |
| 5 | SET_BIT_1 | segment_f | |
| 6 | SET_BIT_2 | segment_g | |
| 7 | SET_BIT_3 | PWM Output |