Simple Uno to WemosD1R1 wifi module connection using SCL and SDA

Projects Programming
1

Hi friends,

I want to transfer Sensor data(ex LM35) which is connected with Arduino UNO to Wemos D1 R1 using SCL and SDA and Wire library option.

I have been trying but no serial monitor display from Wemos. (i wanted to use UNO as Master and Wemos as Slave).

My Schematic: UNO SCL and SDA connected with Wemos SCL and SDA. Wemos was powered from UNO (both volt and ground).

I changed baud rate to many options,but only following appears in Wemos Serial monitor.

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v951aeffa
~ld

Pls help in simple terms.

2

Do you have pullups on the SDA and SCL lines? Is the D1 a 5V or 3.3V device?

3

All GPIOs from Wemos D1 (R1 included) work with 3.3V signals only.

4

I have Wemos D1 R1 board with inbuilt ESP8266 chip. It is similar to Arduino board. Sp power supply is 5v (VIN).

5

SOLVED

Hi I have got the way forward.

I made UNO as slave sender and Wemos as Master reader. Now Wemos Serial monitor can display incoming messages from UNO.

Anything more just contribute ,Lets us discuss. Thanks