文件名称:This is a simple Digital voltmeter project mainly focusing on designing condition circuits and demonstrating a use of An
下载1 (77.18kb)
别用迅雷、360浏览器下载。
如迅雷强制弹出，可右键点击选“另存为”。
失败请重下，重下不扣分。
如迅雷强制弹出，可右键点击选“另存为”。
失败请重下，重下不扣分。
介绍说明－－下载内容均来自于网络，请自行研究使用
Theory behind calculation of Voltage divider circuit.
All we want is input voltage to ADC should not increase 5V and
Our maximum I/p Voltage to voltmeter is 15V only. So we design
the voltage divider circuit as follows.
where Vmax is Maximum i/p voltage to voltmeter.
Vip is i/p voltage to ADC.
R1 and R2 are resistance of voltage divider circuit.
Vmax
---
|
\
/ R1
\
/
|___ I/p (Vip)
|
\
/ R2
\
/
|
|
V
GND
Vmax = 15V
V = R2*Vmax/(R1+R2)
5/15 = R2/R1+R2
3 = R1/R2+1
2 = R1/R2
R2 = R1/2
Lets take R1 as 200K
and R2 will be 100K
Maximum current: Imax = (Vmax-Vipmax)/R1 (approx)
Vmax = 15V
Vipmax = 5V
R1 = 200K
Imax = (15-5)/200 = 10/200 = 0.02mA
All we want is input voltage to ADC should not increase 5V and
Our maximum I/p Voltage to voltmeter is 15V only. So we design
the voltage divider circuit as follows.
where Vmax is Maximum i/p voltage to voltmeter.
Vip is i/p voltage to ADC.
R1 and R2 are resistance of voltage divider circuit.
Vmax
---
|
\
/ R1
\
/
|___ I/p (Vip)
|
\
/ R2
\
/
|
|
V
GND
Vmax = 15V
V = R2*Vmax/(R1+R2)
5/15 = R2/R1+R2
3 = R1/R2+1
2 = R1/R2
R2 = R1/2
Lets take R1 as 200K
and R2 will be 100K
Maximum current: Imax = (Vmax-Vipmax)/R1 (approx)
Vmax = 15V
Vipmax = 5V
R1 = 200K
Imax = (15-5)/200 = 10/200 = 0.02mA
(系统自动生成,下载前可以参看下载内容)
下载文件列表
压缩包 : Project.rar 列表 Project/ISIS Professional/Backup Of Voltmeter.DBK Project/ISIS Professional/ISIS.dmp Project/ISIS Professional/p1.SEC Project/ISIS Professional/prov.DTF Project/ISIS Professional/Voltmeter.DSN Project/ISIS Professional/Voltmeter.PWI Project/Program/calculation.txt Project/Program/cod/lcd.c Project/Program/cod/lcd.h Project/Program/cod/voltmeter.c Project/Program/cod/voltmeter.hex Project/Program/cod/voltmeter.Opt Project/Program/cod/voltmeter.plg Project/Program/cod/voltmeter.Uv2 Project/Program/cod/voltmeter_Opt.Bak Project/Program/cod/voltmeter_Uv2.Bak Project/Program/hex/voltmeter.hex Project/Program/New Text Document.TXT Project/Program/cod Project/Program/hex Project/ISIS Professional Project/Program Project