Published:2011/7/12 7:37:00 Author:Lena | Keyword: remote control, tri-proportion controller
The tri-proportion controller is used to control electromotor rotate speed or oil plants engine accelerograph bulk etc in various power remote control models. Here introduces code/encode and control circuit which can realize above functions.This device realizes the remote tri-proportion control by altering transmitter modulation frequency. Figure 1 is the transmitter frequency regulation circuit, altering the bulk of potentiometer RP can make oscillator frequency change between 100Hz and 1 kHz, the output end of this circuit connects modulation input of high frequency transmitter.
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Published:2011/7/12 3:40:00 Author:Lena | Keyword: radio frequency chip, high credibility, remote control
RF401 is Norway Nordic company newly protrusive data transmission band 433MHZ single piece wireless transceiver chip, this chip integrates high frequency transmitting, high frequency receiving, PLL synthesization, FSK modulation, FSK demodulation, multi-channel switch etc function, and has excellent performance, low power loss, easy usage etc features. Periphery components of nRF401 are very few, only involve one criterion crystal oscillator and few passive devices without debugging parts, this brings huge convenience for development and manufacture.Table 1 is NRF401 electric performance parameters.Table 2 is NRF401 pin function diagram.
Paremeters
Value
Unit
工作频道
433.92/434.33
MHz
调制方式
FSK
频偏
15
KHz
谢频输出功率 0.4k,3v
10
dBm
接收灵敏度 0.4k,BR=20 kbit/s BER<10
-105
dBm
最大传送数码率
20
K bit/s
适用电压范围
2.7~5.25
V
接收状态功耗
250
uA
发射状态功耗 -10 dBM
8
mA
等待状态功耗
8
8uA
Pin
Name
Pin function
Description
1
XC1
输入
参考振荡器输入端
2
VDD
电源
电源端口 (+3-5V DC)
3
VSS
地
地 (0V)
4
FILT1
输入
滤波器接入端口
5
VCO1
输入
压控振荡电感端口
6
VCO2
输入
压控振荡电感端口
7
VSS
地
地 (0V)
8
VDD
电源
电源端口 (+3-5V DC)
9
DIN
输入
发射数据输入
10
DOUT
输出
接收数据输出
11
RF_PWR
输入
射频功率设置
12
CS
输入
通道选择CS= 0 =>433.92MHz(Channel#1)CS= 1 =>434.33MHz(Channel#2)
13
VDD
电源
电源端口 (+3-5V DC)
14
VSS
地
地 (0V)
15
ANT2
输入/输出
天线接口
16
ANT1
输入/输出
天线接口
17
VSS
地
地 (0V)
18
PWR_UP
输入
电源 开/关PWR_UP= 1 =>Power up (Operating mode)PWR_UP= 0 =>Power down (Standby mode)
19
TXEN
输入
工作模式TXEN = 1 => Transmit modeTXEN = 0 => Receive mode
20
XC2
输出
参考振荡器输出端