12. Output devices¶
Group Assignment¶
Power Consumption
We measured the power consumption of a DC motor using a DC motor output board.
Power (in Watt) is calculated by
Power “P” = Voltage “V” x Current “I”
Where V is the voltage across the load and I is the current passing through the load.
To measure the voltage and current we used Digital Multimeter (DMM)
Voltage, the Digital Multimeter (DMM) is connected in Parallel with the load. Current, the Digital Multimeter (DMM) is connected in Series with the load.
Remember to move DMM positive test lead to current measuring position before connecting in series with the load.
To calculate the power consumption of the DC motor:
P = 12.61 x 0.092
P = 1.16 Watt
P = 1160 mWatt
individual assignment¶
files :¶
This week I made an interfacing between the attiny44 with LCD as an output . and here are the components I used in the diagram.
now we are ready to design our circuit using Eagle software . and here is a snapshot of the schematic design .
and the board design is like the following :
Now we follow the same steps we did in electronics production week , so we export the board design as image (png) then using the gimp software we produce the interior and exterior design as follows :
Now our files are ready to use it in Mods:
I milled the design using Roland SRM-20
and here is pinout for 5x2 header and LCD
and the full circuit after wiring and welding :
Problems and fixes:¶
There was a difficulty of operating LCD with attiny44 MCU based on my experience , so I connected the LCD to the ATmega328 MCU as part of my final project, and it works good .
The circuit and programming of LCD is described in details in “Final Project ” page . but I will add the hero shot for it below .