How to connect AD8232 heart monitor sensor to nodemcu directy

Using Arduino Sensors
1

hello, im doing my college project where i need to connect AD8232 heart monitor sensor to nodemcu.
There are many tutorials that tell us how to connect AD8232 to arduino but there is no tutorial on interfacing AD8232 with nodemcu.

product details:
https://learn.sparkfun.com/tutorials/ad8232-heart-rate-monitor-hookup-guide/all

nodemcu im using :

please help me interfacing these devices and get the data ....

thank you.

2

The connection would be the same as for an ordinary 3.3V Arduino BUT the ESP8266 has only one analogue input pin and can only handle voltages up to 1 volt so you will need to use a couple of resistors as a voltage divider to bring down the AD8232 Output signal voltage down to a suitable range for the ESP8266 ADC.

EDIT:
It seems the NodeMCU you refer to has the voltage divider resistors built onto the board so it can handle 3.3V on the ADC pin.

3

TNq for reply.
Can I get the circuit diagram for that plz..
As I'm new to this I have no idea.

4

@Riva
A NodeMCU already has a voltage divider on the analogue input, so accepts 0-3.3volt directly.
Leo..

5

hey,
Can i get any references to interface nodemcu and AD8232 heart monitor..

6

Riva:
The connection would be the same as for an ordinary 3.3V Arduino

7

I have tried connecting as below

nodemcu - AD8232
3.3v 3.3v
GND GND
A0 Output

and there are other 2 pins in AD8232 as L- and L+, where should i connect these in Nodemcu.

8

To two unused digital inputs of the NodeMCU.
Make sure you set the pinMode in the code also to those two inputs.
Leo..

9

TNq @wawa I'll try this And update you..

10

Wawa:
@Riva
A NodeMCU already has a voltage divider on the analogue input, so accepts 0-3.3volt directly.
Leo..

Thanks for that Leo (original post edited to add this little nugget