- Wed Mar 15, 2017 5:03 pm
#63752
Hello everyone, I am doing a home automation project using ESP8266 Olimex board and AREST Cloud server. I am using it along with a relay, to control a lamp. Almost everything works well except that the AREST interface turns ON the lamp when the OFF button is pressed vice versa. Does anyone know what the possible issue may be? Thank you
- Thu Mar 16, 2017 9:19 am
#63783
When using GPIO to drive external devices such LED or relay, it can be connected in 2 ways, sink mode or source mode.
Depending of which mode, turning ON the external device by setting GPIO output either LOW or HIGH depending of the connetion mode.
So, in your case, you need to invert digitialWrite() states.
Depending of which mode, turning ON the external device by setting GPIO output either LOW or HIGH depending of the connetion mode.
So, in your case, you need to invert digitialWrite() states.
- Fri Mar 17, 2017 1:23 am
#63828
Thanks for responding. Your solution works when I use an LED but not a relay.
- Fri Mar 17, 2017 9:18 am
#63844
Check how the relay is hookup on the Olimex schematics.
My explanation should be relevant for relay too, meaning that digitalWrite() inverted state would work there too.
EDIT : I've look at the Olimex schematic, and it is driven in a way that HIGH on GPIO is turning the relay ON.
So, the problem must be somewhere else in you code.
My explanation should be relevant for relay too, meaning that digitalWrite() inverted state would work there too.
EDIT : I've look at the Olimex schematic, and it is driven in a way that HIGH on GPIO is turning the relay ON.
So, the problem must be somewhere else in you code.
