Using Multiple SPST button with one ADC of Arduino

[t_tuku]

Hi all.
I want to create project for home automation where I will use ESP12F as Microcontroller. I am now short of input pins for electrical switches. So I need to create a switch pattern where one ADC pin will use for multiple input option like the picture below.

Remember the switch is SPST not PUSH switch. The picture like this

But, I could not figure out how to do this. A circuit diagram and programming part may be instructed. I have search many in WEB but could not find any solution. please help.

[J-M-L]

an example from this discussion (it's in French but I'm sure google translate can help you out)

[ruilviana]

Be careful, the maximum input value of the ESP8266 is only 1V.

Be careful, the maximum input value of the ESP8266

@t_tuku

ESP12F

is only 1V.

[t_tuku]

Then how to decrease from 3.3. to 1 volt. Shall in use voltage divider network?

[t_tuku]

Let me first translate in English and inform your surely.

[J-M-L]

@t_tuku

Then how to decrease from 3.3. to 1 volt. Shall in use voltage divider network?

if you’re using the bare chip then indeed the ESP8266 ADC pin input voltage range is 0 to 1V.

If you use an ESP8266 development boards, most of them come with an built in voltage divider, so the input range is 0 to 3.3V

depends on what you ave