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Voltage Follower Help Needed

Samuel235 Hardware Contributor last edited by

Does anyone have any experience regarding voltage followers?

I'm looking at implementing a voltage follower into my Electrochemical Sensor circuit for Carbon Monoxide and to remove any electronical noise that could influence the sensor (which its very sensitive too) they recommend i add in a voltage follower before the sensor output gets to the OP AMP to the MCU.

Page 6 of the datasheet shows the voltage follower circuit proposed, but my current circuit is using a non-inverting setup where the proposed schematic (shown below) is using an inverting method. I know that the voltage follower is a non-inverting OP AMP itself, and i know how it works by utilizing the fact no current can flow through a OP AMP, however i just do not know/understand how to use this in my current setup.

How would you go about implementing the voltage follower into my current circuit? Is it even possible to have a voltage follower on a non-inverting setup?

Voltage Follower Circuit

My circuit
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I have success! (oops, that's suppose to be Timer1) I only sample for 1/60 of a second. What I did was to back up all the timer registered I used and then resorted them after I was done sampling. (As opposed to initializing the registers in setup and then starting the timer when needed.) Now I have a Nano sampling the data and sending it to a MySensors Gateway on an RPi3B+ which then sends it to an MQTT broker runing on an old laptop. Also running on the laptop is Home Assistant running inside of VirtualBox. If MySensors does use Timer1, it appears that restoring the registers allows it to be shared. //------------------------------------------------------ISR ISR(TIMER1_OVF_vect){ // interrupt service routine for overflow TCNT1 = TimerPreloadValue; // must be first line! starts the timer counting again digitalWrite(TRIGGER_START_SAMPLE_PIN,HIGH); samplesVolts[--sample]=analogRead(VOLTS_IN_PIN); // decrement before capturing samplesCurrent[sample]=analogRead(CURRENT_IN_PIN); digitalWrite(TRIGGER_START_SAMPLE_PIN,LOW); if (!sample){ // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,LOW); // indicate that sampling is complete samplingEnd = micros(); TCCR1B &= 248; // turns off timer } } //------------------------------------------------------sampleOneCycle void sampleOneCycle(){ // back up timer registers uint8_t TCNT1_b = TCNT1; uint8_t TCCR1B_b = TCCR1B; uint8_t TCCR1A_b = TCCR1A; uint8_t TIMSK1_b = TIMSK1; // configure timer which starts the sampling noInterrupts(); // disable all interrupts TCCR1A = 0; TCCR1B = 0; TCNT1 = TimerPreloadValue; // preload timer //TCCR1B |= (1 << CS10)|(1 << CS12); // 1024 prescaler TCCR1B &= 248; // turns off timer? TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt ISR // demark sampling sample = NUMBER_OF_SAMPLES; // count down to zero digitalWrite(TRIGGER_START_SAMPLE_PERIOD_PIN,HIGH); samplingStart = micros(); TCNT1 = 65535; // first trigger right away! TCCR1B |= 1; // turns on timer interrupts(); // enable all interrupts // wait for sampling to be complete while(digitalRead(TRIGGER_START_SAMPLE_PERIOD_PIN)){}; samplingEnd = micros(); // restore timer registers TCNT1 = TCNT1_b; TCCR1B = TCCR1B_b; TCCR1A = TCCR1A_b; TIMSK1 = TIMSK1_b; }
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Just wanted to say thanks for this, it is still relevant and useful six years later !
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Great! I'm glad it works and thank you very much for reporting back!
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I bought the Every because it implied it was backward compatible with the nano. No, it's not, as we found out. Be that as it may, any word on a getting the Every working with mySensors?

Voltage Follower Help Needed

Voltage Follower Circuit

My circuit

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Voltage Follower Help Needed

Voltage Follower Circuit

My circuit

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Over the air updates
General Discussion • • ToSa

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Hardware • mysensors interrupt nano interrupts esp • • OldSurferDude

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