ESP8266 Community Forum

- Sun Aug 09, 2015 12:08 am #25414 Hi All,
I use OneWire lib to read DS18B20 (pin 2 of ESP8266-12) and I add 7-segment module (IC 74595 built-in) to display temperature value, I found 7-segment blink every time while OneWire executed. When I comment out OneWire lib everything work as normal

Let me show my schematic:
ESP8266-12
Pin 2 <-----> DS18B20
Pin14 <------> SCLK 74595
Pin 4 < -----> Latch 74595
Pin5 <------> Data in 74595

I use TIcker lib to display 7-segment
#include <Ticker.h>
Ticker Segment;
Segment.attach_ms(1,showDisplay);
I test only Ticker lib my 7-segment work OK

after I add OneWire lib my 7-segment is blink when DS18B20 is read.

Could you please any suggest ?

- Sun Aug 09, 2015 8:31 am #25432 How did you connect OE pins 13 of the 74HC595 ?
It should be tied to GND.

- Sun Aug 09, 2015 8:40 am #25433 I use this module http://www.arduinoall.com/product/100/% ... ed-display


as it work normal when it not include. OneWire lib on Esp8266-12

- Sun Aug 09, 2015 10:16 am #25444 I don't see where the problem is ...
Check again your wiring and also the sketch, there is a mistake somewhere, because there is no way the OneWire lib should interact with the other pins.