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| 型号： | DM240002 |
| 厂商： | Microchip Technology |
| 文件页数： | 23/42页 |
| 文件大小： | 0K |
| 描述： | BOARD DEV EXPLORER 16 44-PIN |
| 标准包装： | 1 |
| 系列： | Explorer 16 44 引脚 |
| 类型： | MCU |
| 适用于相关产品： | dsPIC30，dsPIC33，PIC32，PIC24FJ，PIC24HJ |
| 所含物品： | Explorer 16 开发板，PIC24FJ64GA004 和 dsPIC33FJ32GP204 PIM 模块 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
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44-Pin Demo Board Lessons
3.2.4
Lesson 4: Analog-to-Digital
This lesson shows how to configure the ADC, run a conversion, read the analog voltage
controlled by the potentiometer (RP1) on the board, and display the high order 8 bits
on the display.
The PIC16F887 has an on-board Analog-to-Digital Converter (ADC) with 10 bits of res-
olution on any of 14 channels. The converter can be referenced to the device’s V DD or
an external voltage reference. The 44-pin Demo Board references it to V DD as provided
by the PICkit 2 Microcontroller Programmer. The answer from the ADC is represented
by a ratio of the voltage to the reference.
ADC = V/V REF * 1023
Converting the answer from the ADC back to voltage requires solving for V.
V = ADC/1023 * V REF
Two of the three factors on the right side of the equation are constants and may be cal-
culated in advance. This eliminates the need to actually divide, but still requires fixed
or floating point multiply to solve the equation on the fly.
However, sometimes, such as when reading a sensor, calculating the voltage is only
the first step. There may be additional math to calculate the meaningful data from the
sensor. For example, when reading a thermistor, calculating the voltage is only the first
step on the way to getting the temperature.
There are other means to convert ADC values, including a straight table look-up or a
piece-wise linear interpolation. Each of these represents different speed/memory
trade-offs.
The schematic ( Appendix A. “Hardware Schematics” ) shows the wiper on the poten-
tiometer is connected to pin RA0 on the PIC16F887.
Here’s the checklist for this lesson:
? Configure PORTA as an analog input, TRISA<0> = 1 , ANSEL<0> = 1
? Select justification and V REF source in ADCON1.
? Select clock scaling and channel in ADCON0.
? 2007 Microchip Technology Inc.
DS41296B-page 19
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| DM240311 | BOARD DEV PIC24F16KA102 XLP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DM240002 | 制造商:Microchip Technology Inc 功能描述:Explorer 16 kit(44-PIN) w/ PIC24FJ64GA00 |
| DM240011 | 功能描述:开发板和工具包 - PIC / DSPIC MPLAB Starter Kit for PIC24F MCU RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM240012 | 功能描述:开发板和工具包 - PIC / DSPIC PIC24E USB Starter Kit RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM240013-1 | 功能描述:开发板和工具包 - PIC / DSPIC Microstick for 3V PIC24F K-series RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
| DM240013-2 | 功能描述:开发板和工具包 - PIC / DSPIC RoHS:否 制造商:Microchip Technology 产品:Starter Kits 工具用于评估:chipKIT 核心:Uno32 接口类型: 工作电源电压: |
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