The voltage rose gradually until it stopped at 0.773 V, lets calculate the tempreture.
Temp = (0.773 * 100 ) - 50 = 27.3 degrees celcius

measuring something by adding a sensor to a microcontroller board that I have designed and reading it

the sensor I have chosen to add to circuit I designed previously is a greyscale analog sensor. The datasheet for the sensor can be found here . It is the JMP-BE-1111 analog grey scale sensor. It's a part of a robotics kit but I am using it here on its own connected to my circuit to measure different levels. I have used grey scale sensors before in creating robots normally for locating purposes, for example when it comes to following a line or something of that sort, a grey scale of a color sensor is very helpful.
The greyscale sensor works by shining a light at an object and then recording the intensity of the reflection (brightness). Wenb lookig at it you can see that there are two different parts, one that shines light and one that recieves the reflection.

The sensor recieves 5Volts as per the data sheet and outputs an analog voltage on its data pin according to the color of the material places infromnt of it.
I created a small code to read the analog data recieved through the analog to digital converter in the board and reading them through the serial monitor

#include < SoftwareSerial.h >
#define RX PA1
#define TX PA0
#define sensePin PA6
SoftwareSerial mySerial(RX, TX);
int sensorInput; //The variable we will use to store the sensor input
void setup() {

mySerial.begin(9600);
pinMode (sensePin, INPUT);
}
void loop() {
// put your main code here, to run repeatedly:
sensorInput = analogRead(sensePin); //read the analog sensor and store it
mySerial.print(" Raw reading:");
mySerial.print(sensorInput);
delay(100);
}

I uploaded the code to my board and hooked up the sensor and started recieving data. The board is connected to my pc via a 5volts ftdi cable which is also powering the board

Normally, for robotic uses anyway, the greyscale sensor is used to distingish between black and white. I adjusted the code based on the data I found to light the led when the greyscale sensor is pointed at a black surface. (which yeilds a very low voltage according to the results we observed.
Conducting this "calibrating" test is a good idea to observe the differences between the data given as it depends on the lightning of the room as well a lot of the time. I used 150 as my cuttoff point to detect black

#define sensePin PA6
int sensorInput; //The variable we will use to store the sensor input
int ledPin = PA3;
void setup() {
pinMode (sensePin, INPUT);
}
void loop() {

sensorInput = analogRead(sensePin); //read the analog sensor and store it
if (sensorInput < 150) {
digitalWrite(ledPin, HIGH); }
else
{
digitalWrite(ledPin, LOW); }
}

Input circuit design and fabrication

For the input circuit design and fabrication, this is a mutal circuit between this week and the output week. I designed a circuit that contains three permanent input devices (two push buttons and one potentiometer). we have covered push buttons betore and they are quite straight forward (digital device on or off only), so I will focus my attention on the potentiometer.

I have on 10k ohm potentiometer. A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.It is a a variable resistor with a third adjustable terminal. The potential at the third terminal can be adjusted to give any fraction of the potential across the ends of the resistor. It is great for a lot of applications in which users input is nesessery to adjust a spicific value, for example volume.
I connected the potentiometer to one of the pins in which I can read its value through the analog to digital converter, thus givinbg me a value of 0 to 1023. Full schematic below.

For more information on the fabirication process and board design and the code that combines input and output devices of this circuit, it is all posted on this page here