I have done a video of three bad PCA9685 controllers I bought of eBay
Using you own application, to communicate with the Arduino:
I use Visual Basic.
I send data like this:
If OKtoSendData And SerialPort1.IsOpen Then
OKtoSendData = False
SerialPort1.Write(New Byte() {86,
BitConverter.GetBytes(Value_00)(0), BitConverter.GetBytes(Value_00)(1),
BitConverter.GetBytes(Value_01)(0), BitConverter.GetBytes(Value_01)(1),
BitConverter.GetBytes(Value_02)(0), BitConverter.GetBytes(Value_02)(1),
BitConverter.GetBytes(Value_03)(0), BitConverter.GetBytes(Value_03)(1),
BitConverter.GetBytes(Value_04)(0), BitConverter.GetBytes(Value_04)(1),
BitConverter.GetBytes(Value_05)(0), BitConverter.GetBytes(Value_05)(1),
BitConverter.GetBytes(Value_06)(0), BitConverter.GetBytes(Value_06)(1),
BitConverter.GetBytes(Value_07)(0), BitConverter.GetBytes(Value_07)(1),
BitConverter.GetBytes(Value_08)(0), BitConverter.GetBytes(Value_08)(1),
BitConverter.GetBytes(Value_09)(0), BitConverter.GetBytes(Value_09)(1),
BitConverter.GetBytes(Value_10)(0), BitConverter.GetBytes(Value_10)(1),
BitConverter.GetBytes(Value_11)(0), BitConverter.GetBytes(Value_11)(1),
BitConverter.GetBytes(Value_12)(0), BitConverter.GetBytes(Value_12)(1),
BitConverter.GetBytes(Value_13)(0), BitConverter.GetBytes(Value_13)(1),
BitConverter.GetBytes(Value_14)(0), BitConverter.GetBytes(Value_14)(1),
BitConverter.GetBytes(Value_15)(0), BitConverter.GetBytes(Value_15)(1),
13, 10
}, 0, 35)
}
Threading.Thread.Sleep(100) 'wait a little for comunication to end.
End If
The above:
86 = ASCII for V.
BitConverter splits the values(16bit) in the array(16) into two bytes(8bit).
13 = ASCII for Carriage Return.
10 = ASCII for Line Feed.
As you are only turning on or off, your values will be 0 or 4095
To change to a different PCA I send the address-64 and the frequency I want it
set at.
My basic code looks like this:
If OKtoSendData And SerialPort1.IsOpen Then
OKtoSendData = False
Dim frequencyBit0 As Byte = BitConverter.GetBytes(Convert.ToInt16(My.Settings.Frequency_NumericUpDown))(0)
Dim frequencyBit1 As Byte = BitConverter.GetBytes(Convert.ToInt16(My.Settings.Frequency_NumericUpDown))(1)
My.Settings.DeviceAddress = DeviceAddress
SerialPort1.Write(New Byte() {65,
DeviceAddress,
frequencyBit0, frequencyBit1,
13, 10}, 0, 5)
End If
65 = ASCII for A.
DeviceAddress is only 1 byte as I have reduced the value by 64.
frequency needs to be split into two bytes.
13 = ASCII for Carriage Return.
10 = ASCII for Line Feed.
It has to be bytes (8 bit values) you send.
V or A followed by numbers wont work, that would just be send as text values.
So for example:
To send command to change PCA at address 64 and set frequency to 1000 Hz, would
need the following:
ASCII A = 65, to let Arduino know its an address change. (ASCII for V would let
Arduino know 16(32) values are coming)
Address = 64 - 64 = 0
frequency = 1000, split this 16 bit value in to 2 8 bit values, LSB and MSB.
1000 16bit binary = 0000 0011 1110 1000.
LSB = 1110 1000 = 232
MSB = 0000 0011 = 3
A carriage return and line feed. 13 and 10.
So sent would be: 65 0 232 3 13 10
Your app must send it as bytes not text.
When Arduino receives a correct command it will confirm it in normal ASCII text,
also Arduino will send an "ok".
When your app. receives an "ok" from Arduino, your app. knows that it can send
another command.
An example of sending values would be:
As my script shows it: V 4095 4095 0 0 0 0 0 0 0 0 0 0 0 0 0 0
as it is sent in bytes: 86 255 15 255 15 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 13 10
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