[SOLVED] 8574 pullup resistor?

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leel1967l
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Posts: 73
Joined: 30 Nov 2017, 18:29

[SOLVED] 8574 pullup resistor?

#1 Post by leel1967l » 16 Mar 2018, 00:45

Hi all,
i am struggling with this issue.

My config:
ESP8266 Wemos D1
PCF8574
8 relay board
No devices configured and no rules configured.

When I startup the unit some relays gets activated.

Do I need pullup resistors with PCF8574?
Last edited by leel1967l on 16 Mar 2018, 19:13, edited 1 time in total.
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leel1967l
Normal user
Posts: 73
Joined: 30 Nov 2017, 18:29

Re: 8574 pullup resistor?

#2 Post by leel1967l » 16 Mar 2018, 19:12

Solved:
Using VCC=3.3V there was a problem during startup.

Using VCC=5V there was NO problem at all
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