![How to detect pool heater off due to low flow? It says Lo on display when flow is restricted : r/homeautomation How to detect pool heater off due to low flow? It says Lo on display when flow is restricted : r/homeautomation](https://external-preview.redd.it/GM7rQwLvYJYZnXPZw5Gsguo8qrInsmdSEX_vt_CGyLE.jpg?auto=webp&s=2db8f27383085018987bcd5d3fcb29b35f4b7606)
How to detect pool heater off due to low flow? It says Lo on display when flow is restricted : r/homeautomation
interrupts are not passed to userspace (e.g. poll()) when an interrupts occurs on a gpio pin on a raspberry pi 4 · Issue #5159 · raspberrypi/linux · GitHub
![GitHub - fivdi/pigpio: Fast GPIO, PWM, servo control, state change notification and interrupt handling with Node.js on the Raspberry Pi GitHub - fivdi/pigpio: Fast GPIO, PWM, servo control, state change notification and interrupt handling with Node.js on the Raspberry Pi](https://raw.githubusercontent.com/fivdi/pigpio/master/example/distance-hc-sr04.png)
GitHub - fivdi/pigpio: Fast GPIO, PWM, servo control, state change notification and interrupt handling with Node.js on the Raspberry Pi
![Interrupt-driven I/O on Raspberry Pi 3 with LEDs and pushbuttons: rising/falling edge-detection using RPi.GPIO | by R. X. Seger | Medium Interrupt-driven I/O on Raspberry Pi 3 with LEDs and pushbuttons: rising/falling edge-detection using RPi.GPIO | by R. X. Seger | Medium](https://miro.medium.com/v2/resize:fit:1188/1*op17q0c7tofJNA0w_LSupQ.png)