Hi,
I post this because I want to correct my plan and my calcul.
I use my ATMega328 Microcontrollers on 3.3V in my Arduino at 8MHz.
**broken link removed**
My plan and my calcul it is ok?
My resistance 2200 ohms in the Mosfet plan is ok?
I no understand how make calcul for this resistance 2200 ohms.
Thank you for your help and your correction!
I post this because I want to correct my plan and my calcul.
I use my ATMega328 Microcontrollers on 3.3V in my Arduino at 8MHz.
Calcul transistor of the relay :
-J'ai utilisé 1 relais donc la résistance de la bobine est de 27.8 ohms.
- 1 diode 1N4007.
- 1 transistor 2N2222.
- 1 resistor 240 ohms.
The relay coil amperage is (3.3 volts / 25 ohms = 0.132 amperes) (is the intensity of the collector of transistor IC)
There are 2 operation for to find the value of the resistance between the transistor and the digital pin of Arduino.
// the intensity of the base of transistor is (IB) = IC / gain saturation.
gain saturation = 150/15=10Collector--Emitter Saturation Voltage (Note 1) VCE(sat) =0,3V (IC = 150 mAdc, IB = 15 mAdc)
IB = 0.132 / 10 = 0.0132 amperes.
// The resistance = 3.3 volts / IB.
R = 3.3 / 0.0132 = 250 ohms (Me i use a 240 Ohms resistance)
For the transistor Mosfet P-channel:
-I use this transistor Mosfet p-channel : IRF7410GPbF
- 1 transistor 2N2222.
- 1 resistance 2200 ohms.
- 1 resistance 10K ohms.
I find this on the web about Mosfet P-channel:
Basic Transistor Drivers for Arduino Micro-Controllers
**broken link removed**
For the power dissipated in a MOSFET: P = RDSon * I²
P = 0.007 * 4² = 0.112 Watts i must dissipated
And the drop down volt: V = R*I
V = 0.007 * 4 = 28mV only
And the drop down intensity = 0
**broken link removed**
My plan and my calcul it is ok?
My resistance 2200 ohms in the Mosfet plan is ok?
I no understand how make calcul for this resistance 2200 ohms.
Thank you for your help and your correction!