Need help dividing analog voltage

Other Hardware Sensors
1

I am using a pulse sensor (https://pulsesensor.com) connected to an Adafruit Feather Huzzah esp8266 board. It draws power from a 3V pin ("the output from the 3.3V regulator that can supply 500mA peak"), and sends the sensor values to the ADC pin. However, this pin has "a 1.0V maximum voltage." I am trying to create a voltage divider but don't know how to go about it. Any help/a diagram showing how to wire this voltage divider on a breadboard, would be greatly appreciated. :slight_smile:

2

Search Google for Voltage Divider. There are loads of examples and calculators available

3

24k + 10k perhaps? That divides 3.4V down to 1.0V Voltage divider - Wikipedia

4

3.3V----////----////---+----////----GND
1k 22k | 10k
|
1.0V

5

Enter R1 to have 30 kOhms and R2 to have 13kOhms to get 0.998 V

6

anjaleen:
I am using a pulse sensor (https://pulsesensor.com) connected to an Adafruit Feather Huzzah esp8266 board. It draws power from a 3V pin ("the output from the 3.3V regulator that can supply 500mA peak"), and sends the sensor values to the ADC pin. However, this pin has "a 1.0V maximum voltage." I am trying to create a voltage divider but don't know how to go about it. Any help/a diagram showing how to wire this voltage divider on a breadboard, would be greatly appreciated. :slight_smile:

Forget the voltage divider.
Use analogReference(INTERNAL) and you will get a range of 0..1.1V at the analog inputs. By the way that will be more independen from Vcc as well.

7

RIN67630:
Forget the voltage divider.
Use analogReference(INTERNAL) and you will get a range of 0..1.1V at the analog inputs. By the way that will be more independen from Vcc as well.

None of that on an ESP8266.
It only has one analogue input with a range of ~0-1volt.
Leo..

8

Wawa:
None of that on an ESP8266.
It only has one analogue input with a range of ~0-1volt.
Leo..

Then, where is the problem?
The sensor delivers 0..1V the ESP needs 0..1V.

9

Then, where is the problem?

The sensor delivers about 3.3V.

10

jremington:
The sensor delivers about 3.3V.

OK, then 27KΩ and 10KΩ according to the common E12 values will provide 0..3,7V range.