PIC32MX250 Pinguino

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Contents

Important Warnings for all Pinguino Users

Important Warnings: Please read the important warnings at least once!

Features

This board can run with either PIC32MX220F032B, PIC32MX250F128B or PIC32MX270F256B microcontrollers in the 32-bit Microchip family.

Characteristics of the board

  • 32-bit MIPS M4K core running at 40MHZ
  • 128kB (MX250) / 32kB (MX220) Flash
  • 32kB (MX250) / 8kB (MX220) SRAM
  • 19 digital I/O pins with 9 shared analog inputs
  • 10 mA source/sink on all I/O pins
  • 2 UART for serial communication
  • 5 PWM outputs
  • 9 analog inputs
  • 10 bit ADC
  • Peripheral Pin Select for mapping digital peripherals to various I/O ports for design flexibility
  • Hardware RTCC provides clock, calendar & alarm functions
  • Charge Time Measurement Unit (CTMU) supports capacitive touch devices
  • Operating voltage 2.3 - 3.6V , 5.5V tolerant digital inputs.

Board overview

There is one reset button and one user button used to switch to bootloader mode.

This board can be powered by the USB connector (5V) or an external power supply.

If powered by VIN, voltage must be > 4.75V (will provide regulated 3.3V)

If powered by VBAT, voltage must be between 2.8V and 4.0V (NB : voltage won't be regulated to run low power modes).

Power sources are automatically selected. No jumper is needed.

Schematics

schematics

Preview

  • (thumbnail)

    Kicad front side preview

  • (thumbnail)

    Kicad back side preview

  • (thumbnail)

    Populated component

  • (thumbnail)

    without Microcontroller

Building Instructions

Bill Of Components

Resistors

Part Value Color Code
R1 100K Ohm brown - black - yellow
R5,R6 10K Ohm brown - black - orange
R2 1K Ohm brown - black - red
R3,R7,R8 470 Ohm yellow - purple - brown
R4 10 Ohm brown - black - black

Capacitors

Part Value Comment
C1 22uF/16V Electrolytic capacitor, marked as 22uF//16V
C3,C5,C14 10uF/25V Electrolytic capacitor, marked as 10uF/25V
C7,C10,C12,C13,C2,C4,C6,C11 100nF Ceramic capacitor, marked as 104
C8,C9 22pF Ceramic capacitor, marked as 22

Diodes

  • D2 3mm Red Led (Power Led)
  • D3 3mm Yellow Led (User Led)
  • D1,D4,D5 1N5817

Connectors

  • J1 USB Type-B Female
  • P2,P1 10-pin header (*)
  • P3,P4 2-pin header (*)
  • U2 2x 14-pin round-female header (PIC32MX250F128B socket)

(*) Use 2.54mm Single Row Male Header Strip if you want a breadboard-ready Pinguino, Female if you want it like an Arduino.

Others

  • SW1 Push button (User button)
  • SW2 Push button (Reset button)
  • X1 8 MHz crystal (low profile)
  • U1 TO220, B1117T-3.3 3.3V voltage regulator (or other LM1117)
  • U2 PIC32MX250F032B or PIC32MX220F032B (28-pin DIP package)
  • Q1 TO220, NDP6020P, P-channel Mosfet
  • PCB

Before you start soldering

The PCB has 2 sides :

(thumbnail)
the component side
(thumbnail)
the solder side

On the component side of the board, identify the holes corresponding to the component's leads. Insert the leads in these holes and slightly bend them on the other side of the board so that the component does not fall off when the board is turned over for soldering.

Turn the PCB over and put it on a flat and dry surface with component side facing down.

Hold the solder wire at the interface of any one of the leads and its pad and touch it with the soldering iron tip. The solder will melt and cover the pad within 3 seconds. Retract the soldering iron tip and the solder wire. Repeat this process to solder the remaining leads of the component.

For more info on soldering, see here.

(thumbnail)
Populated component side without Microcontroller
(thumbnail)
Populated component side with Microcontroller

Construction

P32MX250-00.jpg

Silkscreen view

  • Place and solder all the resistors (R1 to R8). Resistors are not polarised, so it does not matter in which direction they are placed, but for aesthetic purposes it makes sense to have them all point in the same direction. Trim the wires.
  • Place and solder all the 1N5817 diodes (D1, D4 and D5). The (black) band on the diode must be at the side of the white band on the PCB silkscreen (white print on the PCB). Trim the wires.
  • Place and solder the two 22pF capacitors (C8 and C9, marked as 22). These capacitors are not polarised, so it does not matter in which direction they are placed, but it makes sense to place them so that you can still read their markings. Trim the wires.
  • Place and solder the 8 MHz crystal. Trim the wires.
  • Place and solder the 2 x 14 round female header strip (as a DIP28 socket).
  • Place and solder the 8 100nF capacitors (C7, C10, C12, C13, C2, C4, C6, C11, marked as 104). These capacitors are not polarised, so it does not matter in which direction they are placed, but it makes sense to place them so that you can still read their markings. Trim the wires.
  • Place and solder the 2 switch buttons (SW1 and SW2). Even if they look to be square, the four leads are not, so take extra care to insert the switch the right way round.
  • Place and solder the 2 LEDs (red D2 and yellow D3). This is a polarised part so the shorter lead must be put connected to GND. In other words: insert the longer wire in the hole at the button side. Trim the wires.
  • Place and solder the 3 polarised 10uF electrolytic capacitor (C3, C5, C14). The white stripe on the side of the capacitor must be at the opposite side of plus sign in the PCB silkscreen (in other words, at the edge of the PCB). Trim the wires.
  • Place and solder the polarised 22uF electrolytic capacitor (C1). The white stripe on the side of the capacitor must be at the opposite side of plus sign in the PCB silkscreen (in other words, at the edge of the PCB). Trim the wires.
  • Place and solder the USB connector (J1). Bend the two metal mounting tabs before soldering.
  • Place and solder Q1 (NDP6020P, P-channel Mosfet) and U1 (B1117T-3.3, 3.3V voltage regulator). The metal back must be at the side of the white band on the PCB silkscreen (in other words, at the USB connector side). Trim the wires.
  • Place the PIC32MX250 (or PIC32MX220) microcontroller in its socket. This will be easier if you first bend the two rows of pins a little bit in towards each other. Note that the microcontroller chip has a notch at one end. This notch must be at the end where the buttons switch are located.
  • Connectors P1 to P4 can be soldered on both side. It's up to you.

ICSP Programming (if required)

In-Circuit Serial Programming (ICSP) is a way to upgrade/burn the Pinguino's firmware (bootloader).

Upgrading/burning the firmware is necessary only in two cases :

  1. you made your Pinguino yourself, you need to burn the bootloader only once.
  2. (in the unlikely event that) you crashed your Pinguino board.

If you bought a commercial board, the bootloader has been already burnt.

Hex files for Pinguino 32MX2x0 boards are available here

Using a PICkit-like programmer

Connect the ICSP cable to the Pinguino pins (see table below) and upload the firmware with (for ex.) MPLABX or with the Microchip Integrated Programming Environment (MPLAB IPE) that comes with MPLABX.

P32MX250-05.jpg

PicKit3 clone connected to the Pinguino 32MX250

ICSP Connector Microchip name Pinguino name Pin on chip
1 MCLR RST 1
2 VDD 3.3V -
3 GND GND -
4 PGED1 D12 4
5 PGEC1 D11 5
6 NC NC -

Using a Pinguino board

TODO

Testing the board

Step Test Expected Result
#1 Connect the Pinguino board to a PC with a USB cable Power led (red) should stays on
#2 Switch to bootloader mode User led should blink at a high frequency
#3 Program the board with a simple example (see below) User led should blink

First Programs : 6 ways to blink a LED

Here are 6 ways to blink the built-in Led (User Led) on your new Pinguino board.

Troubleshooting

Problem(s) with your Pinguino hardware? Find help in the Forum here.

Before posting your problem read this.

Pin Out

Pin name Label Digital I/O up to 5.5V tolerant Analog input Parallel Port CTMU Other
(Periph. Pin Select) 		Pin on Chip Microchip name
0 D0 Yes No AN9 PMCS1 CTED6 SPI SCK2 26 RB15/AN9/C3INA/RPB15/SCK2/CTED6/PMCS1
1 D1 Yes No AN10 PWM4
SPI SCK1 		25 RB14/CVREFOUT/AN10/C3INB/RPB14/VBUSON/SCK1
2 D2 Yes No AN11 PMRD PWM3
SPI SDI2 		24 RB13/AN11/RPB13/CTPLS/PMRD
3 D3 Yes Yes PMD3 CTED4 I2C SDA1
SPI SS2 		18 RB9/TDO/RPB9/SDA1/CTED4/PMD3
4 D4 Yes Yes PMD4 CTED10 SPI SDO2
I2C SCL1 		17 RB8/TCK/RPB8/SCL1/CTED10/PMD4
5 D5 Yes Yes PMD5 CTED3 SPI SS1 16 RB7/TDI/RPB7/CTED3/INT0/PMD5
6 D6 Yes Yes PWM2
SPI SDI1 		14 RB5/TMS/RPB5/USBID
7 D7 Yes No PMA1 CTED9 PWM1
SPI SDO1 		12 RA4/SOSCO/RPA4/T1CK/CTED9/PMA1
8 D8 Yes No PWM0 11 RB4/SOSCI/RPB4
9 D9 Yes No AN5 PMWR Serial Tx1
RTCC pin
I2C SCL2 		7 RB3/AN5/C1INA/C2INC/RTCC/RPB3/SCL2/PMWR
10 D10 Yes No AN4 PMD2 CTED13 Serial Rx1
I2C SDA2 		6 RB2/AN4/C1INB/C2IND/RPB2/SDA2/CTED13/PMD2
11 D11 Yes No AN3 PMD1 CTED12 Serial Rx2
ICSP PGEC1 		5 RB1/PGEC1/AN3/C1INC/C2INA/RPB1/CTED12/PMD1
12 D12 Yes No AN2 PMD0 Serial Tx2
ICSP PGED1 		4 RB0/PGED1/AN2/C1IND/C2INB/C3IND/RPB0/PMD0
13 D13 Yes No AN0 PMD7 CTED1 USERLED 2 RA0/PGED3/AN0/CTED1/C3INC/RPA0/PMD7
14 D14 Yes No AN1 PMD6 CTED2 USERBUTTON 3 RA1/PGED3/AN1/CTED2/RPA1/PMD6
USB D+ D+ No No CTED11 USB 21 RB10/PGED2/RPB10/D+/CTED11
USB D- D- No No USB 22 RB11/PGEC2/RPB11/D-
Vusb3V3 Vusb No No USB 23 VUSB3V3
Reset Rst No Yes Reset switch
ICSP MCLR 		1 MCLR

How to get one ?

You can get a blank PCB, 32MX250 microcontroller with the USB bootloader pre-programmed or complete kit from the Pinguino Shop. Details below.

Kits

If you want to order a complete kit (including the PIC32MX250F128B microcontroller pre-programmed with the USB bootloader), please go to the Pinguino Shop

Europe VAT zone : 16.90 €

World (ex. VAT) : 13,97 € (about 19 US$)

Shipping cost  : 2.00 €

Blank PCBs

If you just want the PCB with silkscreen to build your own Pinguino 32MX250, please go to the Pinguino Shop.

Europe VAT Zone : 6.05 €

World (ex. VAT) : 5.00 €

Shipping cost  : 2.00 €

Pre-programmed PIC32MX250F128B

If you just want the PIC32MX250F128B microcontroller pre-programmed with the Pinguino bootloader to build your own Pinguino 32MX250, please go to the Pinguino Shop.

Europe VAT Zone : 6.05 €

World (ex. VAT) : 5.00 €

Shipping cost  : 2.00 €

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