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The formal name is "top down approach", build the outer stuff and then fill in the stuff below. (I know, for example, that attempts to read the Supply Voltage 32MHz give the wrong answer). Since the Picaxe firmware is in control of the ADC, not you - experimentation may be required. However, this in-turn could lead to problems with the Picaxe - the PIC datasheet cautions against using certain ADC Clock Periods vs certain Device Operating Frequencies. (I know, for example, that attempts to read the Supply Voltage 32MHz gives the wrong answer).įinally, you might be able to work around the issue, by taking more samples - which may involve increasing the clock speed of the 14M2. Maybe you could try one of those and see if you still get the problems?įinally, you might be able to work around the issue, by taking more samples - which may involve increasing the clock speed of the 14M2. Analog Devices have a range of evaluation boards (presumably built to their design rules). It talks for instance, about PCBs using ground-planes both sides. on the physical layout to be used, to guard against RF interference. The AD623 datasheet has quite a lot of info. So they're only just within each other's specs. The AD623 datasheet says " The AD623 is designed to drive loads of 10 kΩ or greater". The PIC16(L)F1825/9 datasheet, says " The maximum recommended impedance for analog sources is 10 kΩ". If push_sens >= sens_zero then let push_sens=0
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Readadc10 C.4,adc 'w4-b8/b9 - strain gauge running If push_sens > sens_zero then let push_sens=0 Symbol push_sens=w1 'w1-b2/b3 - push_sens Symbol pull_sens=w0 'w0-b0/b1 - pull_sens Symbol kill = b27 'Assuming when senor is PUSHed READADC is decreasing Symbol RELAY2=B.4 'Assuming when sensor is PULLed READADC is increasing Setfreq m8 ` Running at 8Mhz, all pause values are x2 times Thanks very much in advance for any input on this. I have an oscilloscope but its about 60 years old analog one and i have tried reading some signals using it but could detect any noise anywhere on the circuit. I have tried different straingauges (loadcell) wit same result. Not sure if this would happened when ran on battery power only. What i have noticed is this random triggering might happen when i turn my table light on or off at times, but id have to try for a good few minutes to make this happen.
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So i am trying to figure out whats causing this random ADC readings and how to go about fixing it. Reading with no load on the loadcell is around 560 the rest of the time. Threashold for the trigger was set to around 500. Screenshot shows the moment false triggering happened when ADC reading went to 386 or so. I have attached Schematic diagram as well as Screenshot of the Terminal. However this random triggering is still happening despite trying to rule it out buy using code.
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Only then if the signal is still less then threshold would the code move on. I have tried to filter any odd readings buy running an extra routine in the program "fire check", which placed a delay of 25ms (50ms at 8Mhz) and re-checking the inut signal once more. I have the System running off Bench power supply but have also tried using battery pack which resulted in the same issue. I am building a strain-gauge and the controller using PICAXE 14M2 and AD623 Instrumental Amplifier.Įverything is working as expected except for one small issue.Įvery now and again PICAXE would get a random reading lower then expected without any changes to the strain gauge.