Re: Isolation
- From: Noway2 <no_spam_me@xxxxxxxxxxxx>
- Date: Tue, 30 Jan 2007 14:40:02 -0500
lerameur wrote:
Hello,
I am building a robot and wanted to have isaltion between the microcontroller and the motor. So Iknow have two batteries (one for each) . I aslo want to have a voltage checker for each battery. Because the reference value is not present when I calculate the voltage on the motor battery I am not able to determine the voltage. I am using a A/D conversion, but seen from the microcontroller , the motor battery is floating. (no good)
I thought of using an opto coupler but some advise me not to because they are non linear. I looked for some isolation amplifier, but these chip are very expensive. Any alternative I could use that could give me a fair reading ?
thanks
ken
Take a look at instrumentation and difference amplifiers. Analog Devices has a pretty good website. I believe that both types of amps can give you a pretty high degree of isolation when used properly. This is especially true of the instrumentation amps, but I also think that they are usually designed with a high gain, so they may or may not work for your application.
.
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