Microchip Technology Humidity Sensor PICtail Dokumentacja Strona 36
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The main microcontroller shares the main control unit with two devices requiring
SPI connections, one device requiring an I
2
C connection, and one device
requiring a UART connection. Table 4 shown below shows the pin name, type
and description of the pins that will be utilized to accomplish this interfacing
Pin
Name
Pin Type
Pin Description
SCK1
Input/Output
Synchronous serial clock input/output for SPI1
SDI1
Input
SPI1 data in
SDO1
Output
Spi1 data out
SS1
Input/Output
SPI slave synchronization or frame pulse I/O
SCK2
Input/Output
Synchronous serial clock input/output for SPI2
SDI2
Input
SPI2 data in
SDO2
Output
SPI2 data out
SS2
Input/Output
SPI2 slave synchronization or frame pulse I/O
SCL1
Input/Output
Synchronous serial clock input/output for I2C1
SDA1
Input/Output
Synchronous serial data input/output for I2C1
U1CTS
Input
UART1 clear to send
U1RTS
Output
UART1 ready to send
U1RX
Input
UART1 receive
U1TX
Output
UART1 transmit
Table 4 Pins used for interfacing
2.2.3 Interfacing
The main microcontroller must interface with all of the components in the main
control unit. Along with the dsPIC33FJ256GP710A (main microcontroller) the
main control unit consists of an SHT21 temperature and relative humidity sensor,
an MRF24J40MB ZigBee wireless transceiver, an MRF24WBOMA 802.11b RF
wireless transceiver, and a 7 inch Evervision LCD module.
The interfacing for the relays requires a single wire from the microcontroller I/O
pin, with a darlington array driver in between the microcontroller and the relay.
The array driver is a surface mount chip that contains several internal transistor
circuits. This component ensures the correct current will be delivered to the relay
and that the I/O pin on the microcontroller will not exceed its maximum current
- Table of Contents 3
- Table of Figures 6
- Table of Tables 7
- 1.1 Executive Summary 9
- 1.2 Motivation 10
- 1.3 Objective 12
- 1.3.1 Remote Sensing Unit 12
- 1.3.2 Main Control Unit 13
- 1.4.2 Detailed Requirements 14
- 1.5.1 Division of Labor 16
- 1.5.2 Coding Breakdown 18
- 1.6 Block Diagrams 20
- 1.7 Timelines and Milestones 21
- 1.8 Budget / Finances 24
- Section 2: Research 26
- 2.1 Research Methods 26
- 2.2 Main Microcontroller 27
- Input / Output Ports: 28
- Memory Type: 29
- Development tools: 29
- Instructions 30
- 2.2.1 General Description 31
- 2.2.2 Pins 34
- 2.2.3 Interfacing 36
- 2.5 LCD Touch Screen 43
- 2.6 Wireless Interfacing 47
- 2.6.2 Wireless Protocols 48
- 2.6.3 IEEE 802.15.4 – ZigBee 49
- 2.6.4 Bluetooth 50
- 2.6.5 IEEE 802.11 – Wi-Fi 51
- 2.7 Smart Phone Application 53
- 2.7.1 Remote Access 53
- 2.7.2 TCP/IP 54
- 2.7.3 Host-to-Network Layer 54
- 2.7.4 Internet Layer 55
- 2.7.5 Transport Layer 55
- 2.7.6 Application Layer 56
- 2.7.7 Microchip TCP/IP Stack 56
- 2.7.8 Implementation 57
- 2.7.9 Microchip HTTP Server 63
- 2.7.10 Implementation 63
- 2.8 MPFS 66
- 2.9 Mobile Web Site 68
- 2.10 iPhone App 68
- 2.12 Power 70
- User Interface 70
- 2.12.2 Remote Sensing Unit 70
- 2.13 Batteries 71
- 2.15 Dampers 73
- Approx. 4' 74
- 18" 75
- 12" 75
- 24" 75
- 2.16 Sensors 76
- 3.5" 77
- 82
- Wireless Sensor 83
- (MRF24WB0MA) 86
- Sensor 89
- 3.3.1 Sensirion SHT21 89
- C Protocol 90
- 3.5 SLCD5 Controller 95
- Processor 97
- 3.5.2 Touch Interface 98
- Program 98
- Description 99
- Command 99
- Arguments 99
- 3.6 Design Summary 102
- Main Control Unit 103
- Main Control System 105
- Secondary 106
- Microcontroller 106
- 4.1.2 Microchip 108
- Section 4: Prototype 108
- 4.1 Vendors 108
- 4.1.1 Reach Technology Inc 108
- 4.1.3 Sensirion 109
- 4.2 Printed Circuit Board 109
- 4.4 Remote Sensing Unit 116
- 4.5 Relays 117
- 4.6 Demonstration 119
- Section 5: Testing 121
- Daughter Board 123
- 5.4 Safety Considerations 125
- 5.5 Equipment 126
- 5.6 Environment 127
- 5.7.1 Final Specifications 127
- 5.7.2 Final Requirements 128
- Bibliography 135
- *Subject of your message: 140
- *Message: 141
- Reach Technology Permission: 143
- Microchip Permssion: 144
- Contact Us 145
- Thanks very much 146
- 727-580-6767 147
- Abbreviations and Acronyms 149
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