Physical push button alongside DHT22 sensor?

[C-Duv]

Hello,
I have an already working setup of a Sonoff Basic running Tasmota (v5.2.4) and reading temperature and humidity on a DHT22 connected on GPIO14 (in Module settings page, GPI014 Sensor is set to 03 DHT22). Both relay state and DHT22 values are retrieved on home automation software via MQTT).

I would like to add a push (momentary) button to this setup so that pushing the button toggles the relay (directly but also sends the new state MQTT message).
I know I'll have to configure the SwitchMode and/or SwitchTopic but I am more concerned about how and where connect the push button...

I have found issue #508 (Toggle Switch on GPIO 1(RX) or 3(TX)) which suggest to use GPIO03 (RX) but it uses a toggle/maintained switch not a push/momentary like I want, so I am not sure the following schema works:

(Ignore the gray "F" zones: they symbolizes female pins on a male header I soldered on the Sonoff board)

[ionciubotaru]

Yes, your schema is OK and must work fine
If you receive false triggers from push button add a small cap between gpio3 and gnd

[smadds]

100nF across the switch will help debounce the switch

[Rene-Auberger]

@smadds do you mean the capacitor will be connected to GND and GPIO3/VCC in parallel to the switch? Or where is it located exactly (sorry, I'm a software guy ;-) and currently refreshing my electronics skills).

[smadds]

It can be either end of the wire - it's just easier to mount it on the back of the switch. Effectively it's between the I/O pin and gnd

[C-Duv]

@ionciubotaru @smadds If I get this correct: I should first try with the 4.7k resistor only.
Then, if I get false triggers, I should add the 100nF capacitor (keeping the resistor).

[2e0vet]

I dont suppose you have documented how you get the temp readings, I have been trying for ages to get this working without success

[C-Duv]

@2e0vet I used a AM2302 sensor connected as follows on the Sonoff:

AM2302 pins:

Pin number	Usage
1	VDD (Power)
2	SDA (Data)
3	Nothing
4	GND (Ground)

(Pins are numbered from left to right: see this specification document).

Connection to the Sonoff:

DHT22/AM2302	Sonoff
VCC (pin 1)	3V3
SDA (pin 2)	GPIO14
GND (pin 4)	GND

(See GPIO Locations for Sonoff pins locations)

Then of the Tasmota web interface, go to Configuration > Configure Module and set the GPI014 Sensor field to 03 DHT22. Click the Save button and the Sonoff should reboot. After a few seconds (~30s) temperatures and readings should be displayed on the web interface main page.

[C-Duv]

My setup (only using a 4.7kΩ resistor) works fine.

In Configuration > Configure Module page, I set GPIO3 Serial In to the value 09 Switch1.
And changed the SwitchMode to 3 by accessing the following URL:
curl http://THE.SONOFF.IP.ADDRESS/cm?cmnd=SwitchMode1%203
(SwitchMode1%203 = SwitchMode1 3 = Set SwitchMode for relay 1 -My Sonoff only has one- to mode 3)