The “Shield” footprint on a CGCOLORMAX2.

Arduino Shield footprint J13
Shield Pins	Pin from software perspective
D0	I/O Pin 21
D1	I/O Pin 22
D2	I/O Pin 23
D3	I/O Pin 24
D4	I/O Pin 25
D5	I/O Pin 26
D6	I/O Pin 27
D7	I/O Pin 28
D8	I/O Pin 29
D9	I/O Pin 30
D10	I/O Pin 31
D11	I/O Pin 32
D12	I/O Pin 33
D13	I/O Pin 34
A0	I/O Pin 35
A1	I/O Pin 36
A2	I/O Pin 37
A3	I/O Pin 38
A4	I/O Pin 39 (see J15 information)
A5	I/O Pin 40 (see J14 information)

J15 – Shield A4 connection. Connect pins 1-2 to have an I2C connection to SDA on the programming header. Connect 2-3 to connect A4 to I/O Pin 12.

J14 – Shield A5 connection. Connect pins 1-2 to have an I2C connection to SCL on the programming header. Connect 2-3 to connect A5 to I/O Pin 13.

A4/A5 on the Shield connection lead to J15/J14 respectively. A4/A5 can be analog inputs or I2C connections depending on how you may want to use them for the shields that you choose. They are not connected to anything to begin with on the CGCOLORMAX2.

If you wish to use A4/A5 for the I2C interface that MMBasic supports, you will want to connect A4 to I/O Pin 12 (J15 pins 2-3) and connect A5 to I/O Pin 13 (J14 pins 2-3).

If you wish to use A4/A5 for the analog interface that MMBasic supports, you will want to connect J15 pins 1-2 and connect J14 pins 1-2.

Examples of putting shields on a CGCOLORMAX2

 

 

CGCOLORMAX2 has support for interface circuits by just adding DIP sockets and chips.

The RS232 circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J23 – RS232 (CGCOLORMAX2 connection side)
Pin	Use
1	TX (CGCOLORMAX2 microcontroller side)
2	CTS (CGCOLORMAX2 microcontroller side)
3	RX (CGCOLORMAX2 microcontroller side)
4	RTS (CGCOLORMAX2 microcontroller side)

Note that in the picture the silkscreen printed on the circuit board is a little bit off. This was fixed in Rev 2b. The labels have been printed offset by .1”.

You can select one of the CGCOLORMAX2’s two serial ports for connection to this circuit.

J24 – RS232 (line/cable side)
Pin	Use
1	RS232 RTS
2	RS232 CTS
3	RS232 RX
4	RS232 TX
5	Ground

 

The RS485 circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J11 – A jumper here will enable RS485 line termination.

J12 – RS485 (line/cable side)
Pin	Use
1	+Vin (Connected to J6)
2	RS485 B
3	RS485 B
4	Ground

The CAN circuit of the CGCOLORMAX2. The driver chip is not populated on the CGCOLORMAX2. The chip is through-hole and can be added by soldering it in place.

J22 – CAN (line/cable side)
Pin	Use
1	CANL
2	CANH
3	Ground

 

 

 

Full-size SD card holder on the CGCOLORMAX2.

D4 – Green “Power/Firmware” LED, left of SD card holder.
D5 – Blue SD card access LED on the right of the SD card holder.

Audio/PWM header.

J8 – Stereo audio (PWM) out. Pin1 is PWM1, pin2 is PWM2, pin3 is ground.

J16 (1×6) / J17 (2×3 pattern next to J16, no silk screen label) are PIC32 programming headers.

J18 – extra connections for PS/2 keyboard.

J18 – 1×4 extra keyboard header. A PS/2 keyboard circuit (the CGKEYCHIP1, for example) can be wired to this extra connector.

J18-1	PS/2 clock
J18-2	Ground
J18-3	PS/2 data
J18-4	+5V

J19 – I2C lines for system (RTC) use. J19-1 is SDA, J19-2 is SCL.

J20 – This header is in parallel with the RTC battery if you choose to not use the coin cell but instead use an external clock battery. J20- 1 is positive. J20-2 is ground. The replacement coin cell is a CR2016.

J21 – This is in parallel with the “Power/Firmware” LED and resistor circuit. You can control the LED via MMBasic commands and this connection will let you control an external circuit in parallel with the LED.

There are connections to ground, +5V, and +3.3V in the “sea-of-holes” prototype area for connecting the custom circuits to power.

A bootloader wire jumper in place on a CGCOLORMAX2.

J7 – A jumper in place is for firmware reload. The two connections can be temporarily shorted together with a short piece of solid wire while applying USB power to the board to put the board on bootloader mode.