ESP8266 Community Forum

I'm working with a HC-SR04 ultrasonic sensor on an ESP-07. It runs at 5V, trigger directly connected to GPIO5 and echo via voltage divider to GPIO14.

As soon as I'll activate the ISR by gpio.trig(echo_pin, "up", echo_isr), instead of calling echo_isr() it instantly triggers all timer alerts (!?!?). For example, a 250ms timer alert suddenly finishes after ~0.5ms. This applies to all timer alerts, repeating or not, as long as the HC-SR04 is running and keeps echoing.

I'm using a custom build image (http://frightanic.com/nodemcu-custom-build). I'll post the code later.

Any known mistakes that would lead to this behaviour ?

Thanks alot,
Watz

Its an issue with the custom build image. Using nodemcu-firmware/pre_build/latest/nodemcu_latest.bin
, the whole thing works perfectly without changes to the code.