Group Assignment – Input Devices- CDMX
General objective (group assignment):
- Probe an input device(s)'s analog and digital signals
- Measuring signals from devices
Development
The first one we measured was the pressure sensor from Rodrigo’s final project.
Specifications
Wokring Voltage: DC 5±0.5V
Working Current: ≤10mA (DC 5V)
Working Voltage: DC 0.5~4.5V
Working Pressure Rate Range: 0~1.2Mpa
Max. Pressure: 2.4Mpa
Destructive pressure: 3.0Mpa
Working Temperature: -20～+ 105
Storage Temperature: -20～+ 105
Measurement Accuracy: ±1.5%FS
Response Time: ≤2.0ms
IP65
Cycle Life: 1,000,000 pcs
This sensor, you supply 5V and just read the analog signal from the green lead.
This is how we connected it to Rodrigo´s board
We are measuring the output voltage from the signal, and we are getting 504.9 mV when idle.
Here is a video of us measuring the value when we blow on it .
As you can see, we get values of up to 540mV when we blow on the sensor.
The second sensor we measured was an LDR from Hugo’s final project.
Here is a video of us measuring the voltage on the LDR, It is reading values of up to 2V when we put a finger over it.
Overall, measuring analog signals is easy when the microcontroller has an Analog to digital converter which in most cases will convert the analog signal to a number between 0 and 255.