文件名称:This is a simple Digital voltmeter project mainly focusing on designing condition circuits and demonstrating a use of An
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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
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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