Temperature controlling of the Electronic toothbrush PDF

Arduino based temperature controlling of the Electronic toothbrush
Solution 1: The required signal conditioning circuit showcases the signal coming from the selected
thermistor and fed to an Arduino UNO board. As Arduino board works for a Power Supply of 0-5 Volts,
we will use the same source of power to provide power to the thermistor circuit.
The output from the thermistor will be an analog signal, so it will have to be calibrated as per the
Arduino UNO’s analog requirement.
The step voltage ¿ 5
1024 V = .0048 V ( fig 1)
Now, if Arduino needs to have an analog value =x
Then, input Voltage for Arduino (or the output voltage for the temperature sensor) = x X .0048 V
Arduino – Thermistor Interfacing- details
Figure 1

Thus, the following figure shows the layout of the circuit to be used for the same:
Figure 2
As per the circuit shown above
v o= ¿ Resistance
¿ Resistance+Variable Resistance 5 V
Fixed Resistance- The value of the fixed resistance should be roughly equal to the resistance of your
thermistor. Here, in this case we have taken it as 10K Ω
Variable Resistance- To find out the relation between Temperature and variable resistance, we shall use
with the following formula:
T = 1
C1 +C2 log R2 +C3 ¿ ¿