Motor Drive Shield Module -L**8N V3.0 -Arduino Compatible
This is the update version of Arduino motor drive shield-L**8N
And add some switches for different applications.
VLO(Voltage Logic Onboard):
When the motor drive chip L**8N work, there are two voltage: Logical voltage (5V) and motor voltage (such as 7.2 V, 9V or *2V). In order to convert the motor voltage of VEX terminal to 5V logic voltage, and this motor driven shield supply with a corresponding voltage transform circuit.
Because the voltage transform circuit's working voltage is restricted (less than *0V), so if motor is greater than *0V, then can not use this voltage transform circuit. The function of VLO switch is to choose the open status of logic transform circuit (switch to "ON") or the closed status of logic transform circuit(switch to "OFF").
(VLC) (Voltage Logic Connected):
Besides L**8N motor driven shield supply with a corresponding voltage transform circuit, you can also directly connect with Arduino's 5V logical voltage terminal to get 5V Voltage.
The function of VLC switch is used for L**8N motor driven shield to choose the connection status with Arduino's 5V logical voltage terminal (switch to "ON") or break status with Arduino's 5V logical voltage terminal(switch to "OFF").
VM(Voltage Motor):
The function of VM is used to choose motor voltage. When L**8N motor driver Shield are connecting with Arduino. There are two ways to supply power to motor:
1, Through Vin pin of Arduino (switch to Vin)
2, Through VEX terminals of motor driven shield (switch to VEX).
Compared with Arduino, L**8N motor driver shield can bear higher voltages and currents, so we must pay special attention to circuit connection. Here are some typical circuit connection modes for references:
1. Motor voltage is from 6V to *2 V
Generally speaking, Arduino can get power through external 6V - *2V transformer(Vin pins of Arduino), if your motor voltage just in this range, that you can just use this external power supply to supply power simultaneously for Arduino and motor. Then VLO, VLC and VM are set as below:
* VLO: OFF
* VLC: ON
* VM: VIN
2. Motor voltage is less than 6V
You can only supply powor to motor through VEX terminals and GND terminals of motor driven shield, because the 5V voltage transform circuit of motor driven shield can not work (VEX voltage is too low), so we can only connect with 5V terminals of Arduino to supply 5V logical voltage for our motor shield. Then VLO, VLC and VM are set as below:
* VLO: OFF
* VLC: ON
* VM: VEX
3. Motor voltage is from *2V to *0V
You can only supply powor to motor through VEX terminals and GND terminals of motor driven shield, but the 5V voltage transform circuit of motor driven shield can work. Then VLO, VLC and VM are set as below:
* VLO: ON
* VLC: OFF
* VM: VEX
4. Motor voltage is from *0V to *6V
You can only supply powor to motor through VEX terminals and GND terminals of motor driven shield, because the 5V voltage transform circuit of motor driven shield can not work (VEX voltage is too high), so we can only connect with 5V terminals of Arduino to supply 5V logical voltage for our motor shield. Then VLO, VLC and VM are set as below:
* VLO: OFF
* VLC: ON
* VM: VEX
More information is the same as Arduino motor drive shield-L**8N