RPI-1031 tilt sensor and Wemos Mini example

In this article we look at a tilt sensor – this time its the RPI-1031 and we will connect it to a Wemos

The RPI-1031 tilt sensor is capable of sensing a change in orientation in four different directions: forward, back, left or right</p

This tilt sensor can be used to detect multiple orientations. Inside the sensor are infrared emitters which are either reflected or not, depending on the orientation of the sensor. By reading the output of the various pins you can easily determine the orientation of the sensor and your project.

Being a tilt sensor this is just a metal ball that rolls around inside the case. The ball is always up against one side even when it is flat.

The sensor needs power and ground, you can then connect the 2 digital pins. These 2 digital pins will output LOW/LOW, LOW/HIGH, HIGH/LOW and HIGH/HIGH depending on the wall it is touching.

Parts Required

 

Name Link
Wemos Mini D1 mini – ESP8266
RPI-1031 RPI-1031 Angle Sensor 4DOF Attitude HM Module 4 Direction For Arduino
Connecting wire Free shipping Dupont line 120pcs 20cm male to male + male to female and female to female jumper wire
sensor shield Expansion IO Board Sensor Shield

Schematic/Connection

Wemos Sensor
3v3 Vcc
Gnd Gnd
D5 S1
D6 S2

 

 

Code Example

The code for this sensor is really basic, it just checks the 2 pins, to see what side is being touched – The simple function simply takes the 2 digital outputs and returns 0,1,2 or 3 depending on the side.

int tilt_s1 = 2;
int tilt_s2 = 3;
void setup(){
pinMode(tilt_s1, INPUT);
pinMode(tilt_s2, INPUT);
Serial.begin(9600);
}
void loop(){
int position = getTiltPosition();
Serial.println(position);
delay(200); //only here to slow down the serial output
}
int getTiltPosition(){
int s1 = digitalRead(tilt_s1);
int s2 = digitalRead(tilt_s2);
return (s1 << 1) | s2; //bitwise math to combine the values
}

 

Output

Open the serial monitor and you should see something like this, I was moving the sensor around.

Not the most intuitive readings admittedly and it seems to work

3
3
3
2
0
0

 

Links

https://github.com/sparkfun/Tilt-a-Whirl_Breakout

 

 

 

 

 

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