Hi there !
I have the project to make a trash compactor. To do this i have a truck wiper motor http://ncr.en.alibaba.com/product/319740439-215097357/180W_Bus_wiper_motor_EMI_EMC_Volvo_bus_wiper_motor_12_24V_NCR_8385_.html ( 180W 24V 30A ) and a worm screw sytem.
To control this motor, i've made a H bridge with this transistors https://www.sparkfun.com/products/10213
To control the intensity consumed by the motor and prevent it from burning, i use a current sensing chip http://http://www.evselectro.com/kits-30a-range-acs712t-elc-30a-module-current-sensor-module-3024
To control all of that, i use ATTiny 84.
My power suplly is 24V 30A and my µC ( The ATTiny 84 ) use 5v suply so i have to convert a part of the 24V to 5V. To do that i use 7805 but i think it will burn or i will lose lot of energy.
I've made the shematics of my circuit and i wonder if it's good or not and what can i change.
PS: The two switch in the schematics are end positio sensor.
Thank :D and sorry for my bad english :/
This H-Bridge will not work
This H-Bridge will not work using only N-FETs. You will need a full bridge N-Channel FET Driver IC like the ISL83204A or look here for a working H-Bridge example created by Oddbot.
I’ve already made a relay
I’ve already made a relay control version of my board but the problem i get i that i need 3 different voltage and current in my circuit.
I need 24V 30A for my motor.
12V 1~2A to control the coil of my relay.
5V 1A max to power my µC and control the transistors who control the coil.
In this schematics i use this relay http://www.aliexpress.com/item/T90-DC12V-PCB-Power-Relay-5pin-2pcs-lot-Free-Shipping/586320728.html and this transistor to control them http://fr.farnell.com/jsp/displayProduct.jsp?sku=9804005&CMP=KNC-GFR-FFR-GEN-LISTINGS&gross_price=true&mckv=s2tWZb1tB|pcrid|productlistings
Here is the new one ( I
Here is the new one ( I change 12V relay to 24V to have only 2 diffrent volatges in the circuit ) :