Custom Made dsPIC33CH512MP508 v0.2 Development Board
Compiler: CCS C v5.091
Schematics : Proteus 8.9
Features
Battery backed RTC unit
128x64 OLED screen for interface
5 onboard input buttons
Additional RAM and EEPROM units
Fully controllable wireless module
USB powered
Selectable analog referance source
Selectable EEPROM i2c address
Selectable UART2 connection source
Dedicated UART1 connection and re-programmable uart-to-usb chip
Programmable USB host option
All microcontroller pins are mapped out
Onboard Devices
Microcontroller : dsPIC33CH512MP508
SRAM : 23K640
EEPROM : 24LC256
Real Time Clock : DS1338Z-33+
Screen : OLED 0.96” (I2C)
Relay : HK23F-DC5V-SHG
USB Bridge Chip : CP2102-GMR
USB Host Chip : VNC2-32Q
Dedicate Microcontroller Pins
PB5 (RP37) : C IIC 2nd. channel SDA pin
PB6 (RP38) : C IIC 2nd. channel SCL pin
PB8 : I ICSP data pin
PB9 : I ICSP clock pin
PC5 (RP53) : C UART 2nd. channel CTS pin
PC8 (RP56) : C SPI 2nd. channel SCK pin
PC9 (RP57) : C SPI 2nd. channel SDI pin
PC10 (RP58) : C UART 2nd. channel RTS pin
PC11 (RP59) : C UART 2nd. channel RX pin
PC14 (RP62) : O Connected to ESP RX pin
PC15 (RP63) : I Connected to ESP TX pin
PD0 (RP64) : C UART 1st. channel TX pin
PD1 (RP65) : C UART 1st. channel RX pin
PD2 (RP66) : C UART 1st. channel RTS pin
PD3 (RP67) : C UART 1st. channel CTS pin
PD4 (RP68) : C UART 2nd. channel TX pin
PD8 : C SPI 2nd. channel SDO pin
PD9 : O 23K640 SRAM SPI CS pin
PE0 : O CP2102 Reset Pin
PE1 : I Input Button 1
PE2 : I Input Button 2
PE3 : I Input Button 3
PE4 : I Input Button 4
PE5 : I Input Button 5
PE6 : O Relay Control
PE7 : O ESP Enable and reset control
*O : Output pin
*I : Input pin
*C : Communication pin
Jumper Sets
UART2 : Connects default UART2 pins to VNC2 (USB HOST) chip or external source
VNC2_PRG : Sets VNC2 chip to default connection mode or to program mode
EEPROM_ADD : Changes EEPROM I2C address. Default is 000.
AN_SRC : Connects (Analog) A_VDD and A_VSS to VDD and VSS or to an external source.
Occupied I2C Addresses
0xD0 : DS1338Z-33+ 8 bit write address
0xD1 : DS1338Z-33+ 8 bit read address
0xA0 : 24LC256 8 bit write read by default (remapable)
0xA1 : 24LC256 8 bit write address by default (remapable)
0x78 : 0.96” Oled Screen 8 bit write address
0x79 : 0.96” Oled Screen 8 bit read address
Known Issues
VNC_PRG_TM port won’t program the VNCII chip.
To program VNCII chip, a jumper set from from EXT to VNC2 on UART2 jumper set will be needed.
UART1 is dedicated to uart-to-usb bridge chip and cannot be used by any other means
UART2 is shared by 3 sources and can be used by only 1 of them, wireless module, USB host and external input. USB host and external inputs are connected to same lines and can be selected via UART2 jumper set. Wireless module is connected to different lines end either UART2 can be assigned to these pins or a software uart channel can be set.
OLED Screen socket is not compitable with 0.96” screen’s pinout which is planned to use when designing but it is compitable with 1.3” screens.
CP2102 usb-uart bridge desoldered, UART1 is now free and can be directed to ESP or VNC directly.
