goros1993
commented
8 years ago Most components seem pretty easy to use and solder except the microcontroller. I found a breakout board for it, but I realized that the Arduino Uno uses the same controller, maybe we can use an arduino to make some tests. And we could get the ATmega328P for a lower power consumption if necessary.
Regarding the current sensor, we get an output that is proportional to the current that goes through the resistor we choose, but I don't know how that translates to the control of the dc motor. My guess would be that this can control the speed but I am not sure.
vmayoral
jlamperez
imuguruza
OPENSERVO V2 COMPONENT LIST:
ACTIVE COMPONENTS
MCU COMPONENTS:
ATmega168 MCU (However, it is obsolete) -> Replaceable by the ATmega328
The Atmel ATmega328 is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle, the ATmega328 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.
Breakout Board 6 € Datasheet
LM3480 Linear Voltage Regulator.
It’s a linear voltage regulator. It converts the input voltage to a constant value of 5V. Note that 2 capacitors between Vin and GND and Vout and GND are needed to achieve stability and an adequate transient performance. We can also add a Diode at the output to protect the circuit from reverse current during low voltage serial programming.
No breakout board but easily solderable pins 1.21 € Datasheet
H-BRIDGE COMPONENTS
IRF7309 Power Mosfet
This component is used when creating the H-bridge to power the dc motor. It consists of one n-channel and one p-channel mosfet. We will need two of these to build a full h-bridge. The motor goes between the two half h-bridges. If we activate the transistors in diagonal, we will have a current flowing in one direction or another, making the motor rotate in the same way.
Order 1.20 € x 2 Datasheet
ZXCT1009 current sensor
It’s a current sensor used to control de DC motor. It uses a shunt resistor to translate it into a proportional output current. However, I am not very sure how this is implemented later on in the circuit. Order here 0.92€ Datasheet
PASIVE COMPONENTS:
These components can be bought from these websites, however for the first version we can use components that are not SMD type for an easier first version layout.
0.1 Ohm resistor (x1) 2k resistor (x1) 4.75k resistor (x2) 1k resistor (x2) 100k resistor (x4)
0.1 uF 16V ceramic capacitor (x7) 33uF 16V tantalium capacitor (x1) 1uF 16V tantalium capacitor (x2)
More Datasheets
Resume table: