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    Counter module/input

    Hi, I am working on a small project at home where I want a count down module. Either analogue or digital input, don't mind too much at the moment. But what I want to do is be able to input a length of time in hours, the timer to count down, and then use this timer value going into an MSP430...
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    Successive approximation ADC

    Hi all, thanks a lot for all the help. It makes much more sense now and I have been able to answer the question :) I have one more question though, the question is phrased as such: "How many approximations are made to complete the conversion of an input signal of 0.8125V and the final binary...
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    Successive approximation ADC

    Ok , so I think it makes more sense now. so the first comparison is against 1/2 of the reference voltage. The second comparison halves the first comparison (Effectively 1/4 of the reference voltage). The third comparison halves the second comparison (effectively 1/8 of the reference voltage)...
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    Successive approximation ADC

    I don't understand that statement. I guess it is 244uV from 1/4096. But I don't understand what you mean by then... everytime you set a bit starting from zero. I really appreciate you taking the time to help me but... you need to appreciate I know nothing about these ADCs except what I have...
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    Successive approximation ADC

    So.... for 0.4V for example MSB = Vin (0.4V) is less than half Vref so MSB is 0. bit 1 = Vin is greater than 1/4 Vref so bit 1 is 1 bit 2 = this is where I get lost.... thanks
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    Successive approximation ADC

    hi thanks for the reply. If the reference voltage is 1V, divided by 2 is 0.5. so would it be 0.5^12? This returns a number I wouldn't associate with digital electronics though. I have found stuff online saying that you check in input voltage against the Vdac. So if Vin is greater than Vdac...
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    Successive approximation ADC

    Hi, I am doing an HND in instrumentation and control engineering, I have the following question to which I can find nothing in my teaching material even relating to it!! I have searched online and read a bit about SAR ADCs but cannot find how to do this... The full range of a 12bit...
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    mv to ma current amplifier design

    @duke37 Thanks for your reply - in my circuit it is DC powered, would this have an effect? thanks
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    mv to ma current amplifier design

    Hi, I am currently working on a instrumentation amplifier design to accept mV inputs and provide a 4-20mA output. It is to be used with various industrial sensors like load cells (load is in tonnes/kg not voltage). The problem I am facing is that I do not know for sure what instrumentation...
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    MSP430 or similar serial input

    Hi, I want to build a small data logger which can accept either an RS232 or RS485 input. I want to use a uC rather than buy an existing datalogger and build up a circuit myself. Before I even look into the data logging side. Can anyone point me in the right direct on how to get a serial...
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    Solar charging.

    Hi, I am just starting to look into turning a product I have into wireless version which solar charging. I was hoping someone could help me with the basics of charging which I haven't looked into much before. My circuit requires 205mA max at 12VDC. I have a 12VDC SLA battery with a 14Ah...
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    remote on/off

    Hi, I need to build a circuit for a project at work and would like peoples opinions on what I have so far. Outline: I have an instrumentation amplifier which will be powered by a 9VDC battery. The amplifier outputs 4-20mA. I am building a small circuit to attach to the battery and amp which...
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    Reducing Boolean algebra

    Are you able to explain to me how you would get the correct answer? Rather than just write the correct answer. Or if my answer is wrong where I have gone wrong? I have read sections from two text books but I am still struggling. I cannot draw up a truth table to solve it because the exercise...
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    Reducing Boolean algebra

    Hi, I am new to the forum so hello to all. I am studying a BTEC in EE and going onto a HND hopefully next year. I am struggling a bit with reducing boolean algebra. I seem to be able to look at the same problem 3 times and come up with three different answers. Can someone give me some hints...
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