1. ELECTRONIC SYSTEMS NESI NanoRacks Embedded System Integration Board HARDWARE Functional Design

2. ELECTRONIC SYSTEMS NESI Board Functional Block Diagram

3. ELECTRONIC SYSTEMS Overview

4. ELECTRONIC SYSTEMS PIC24FJ256GB106 Legend: AN – Analog Input DI – Digital Input DO – Digital Output RP – Remappable Peripherals SOSC – Secondary Oscillator I/O U - Unity Gain Buffer

5. ELECTRONIC SYSTEMS Power 5V USB 19 38 35 26 10 19 57 8 19 27 PIC24 Switch V DD AV DD V SS AV SS V SS V DD V USB ENV REG 3.3 V V DD 3.3 V Voltage Regulator 5V 3.3V DC-DC Booster 5V 6V

6. ELECTRONIC SYSTEMS USB Mass Storage Interface Switch 5V PIC24 D+ D- 37 36 USB Slave D+ D- D+ D- VBUS GND USB USB Type B Jack PIC24

7. ELECTRONIC SYSTEMS Push Button 64 PIC24 1 2 JP14 Button DI E4 3.3V Pull up Resistor External button access

8. ELECTRONIC SYSTEMS Resistive Sensors JP5 3.3V A B Resist or 16 JP3 3.3V A B Resist or 13 15 JP4 3.3V A B Resist or 14 U JP6 3.3V A B Resist or U PIC24 AN0 AN1 AN3 AN2 U U Resistors selected based on sensor's nominal value

9. ELECTRONIC SYSTEMS Power Output Header 1 3 5 JP10 2 4 6 5V 3.3V 5V 3.3V

10. ELECTRONIC SYSTEMS Real Time Clock 47 484 1 32.768 K Oscillator SOSCI SOSCO PIC24

11. ELECTRONIC SYSTEMS Power Drivers Power Driver A IC4 1 7/8 2 3 Low Side Power Driver Enable PIC24 DO E7 5V 1 2 JP2 Attach load here 6V 1 2 JP11 Power Driver B 2 3 JP16 1 Voltage Selection port 5V Attach load here 4 Resistor Status Resistors divide voltage down to 3.3V range for status to microcontroller Resistor DI G6 IC1 60 2 1 7/8 Enable Low Side Power Driver DO E0

12. ELECTRONIC SYSTEMS 4 IC4 2 4 PIC24 5/6 Heater Enable Low Side Power Driver DO G6 AN4 Gas Sensor H2 B1 B2 H1 A1 A2 CO 2 6V 5V Gain 12 Offset 2 3 JP9 1 Voltage Selection port

13. ELECTRONIC SYSTEMS Camera 614 Camera Enable 5/6 2 3 JP15 1 2 3 JP7 1 4 2 3 JP13 1 4 6 5 On Board Camera Mount Secondary Header TX RX IC1 3 Low Side Power Driver 3.3V Camera Power Control Header PIC24 RP19 RP26 PIC24 DO E1

14. ELECTRONIC SYSTEMS Gas Sensor 6V Gain Offset 4 IC4 2 4 PIC24 5/6 12 Heater Enable Low Side Power Driver DO G6 AN4 2 3 JP9 1 5V Voltage Selection port H2 B1 B2 H1 A1 A2 CO 2

15. ELECTRONIC SYSTEMS Memory Primary SD Card Secondary SD Card 45 46 44 50 55 43 42 3 Chip Detect Primary Chip Detect Secondary Chip Select Primary Chip Select Secondary SCLK MISO MOSI PIC24 DI D7 DO D2 SPI DO D9 DI D8 SPI

16. ELECTRONIC SYSTEMS Expansion Header 54 8 23 27 33 1 3 5 7 9 JP8 DIO G9/ RP27 DIO F3 /RP16 2 4 6 8 10 11 24 28 3.3V AN10/ DIO B10 AN12/ DIO B12 AN5/ DIO B5 /RP18 AN11/ DIO B11 AN13/ DIO B13 DIO D6 PIC24

17. ELECTRONIC SYSTEMS Communication Header 1 3 5 JP12 2 4 6 3.3V 53 51 DIO D5 /RP20 PIC24 DIO D3 /RP22 52 50 PIC24 DIO D4 /RP25 DIO D2 /RP23

18. ELECTRONIC SYSTEMS Comm. Header Example 1 3 5 JP12 2 4 6 3.3V 53 51 RP20 PIC24 RP22 52 50 PIC24 RP25 RP23 1 3 5 JP12 2 4 6 3.3V 53 51 RP20 PIC24 RP22 52 50 PIC24 RP25 RP23 SPI Application UART Application CTS RTS RX TX CS SCLK MISO MOSI TX - transmit RX - receive RTS – request to send CTS - clear to send MOSI – master out slave in MISO – master in slave out SCLK – slave clock CS – chip select

19. ELECTRONIC SYSTEMS LEDs Resistor chosen based on LED current requirements 5V LED 3 5/6 4 21 Low Side Power Driver IC2 LED Enable Current Limiting Resistor 1 2 LED LED Enable 2 1 7/8 22 Low Side Power Driver IC2 Current Limiting Resistor 1 2 PIC24 DO B8 DO B9 External ports used for through hole LEDs

20. ELECTRONIC SYSTEMS Programming Interface 7 18 17 PICkit 1 4 5 PGC Clock PGD Data MCLR JP1 PIC24 Power must be applied through USB to program