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by Brandon92
Sun Feb 28, 2021 2:12 pm
Forum: Beginners
Topic: PWM AC Dimmer
Replies: 25
Views: 7318

Re: PWM AC Dimmer

The leading edge methode is not ideal to dim those lights. You need a trailing edge dimmer for those light. Also some led are not dimmable at all. And zero cross detection is not the problem, in fact you need that. Here you can find more information about it: https://www.lamps-on-line.com/leading-tr...
by Brandon92
Fri Feb 26, 2021 7:18 pm
Forum: Beginners
Topic: PWM AC Dimmer
Replies: 25
Views: 7318

Re: PWM AC Dimmer

What is the exact light that you are using. It is possible that the light will not dim via the "Leading Edge Dimmer" methode.
by Brandon92
Fri Jan 08, 2021 9:28 pm
Forum: Automation, sensing and robotics
Topic: Problem measuring DC current with ADS712 (with code)
Replies: 8
Views: 391

Re: Problem measuring DC current with ADS712 (with code)

What is the type of load that you have connected to the ADS712 when you see the strange behavior. And how did you connected everything together. Did you add for example some decouple capacitors at various places? And are you using long wires.
by Brandon92
Wed Jan 06, 2021 6:44 pm
Forum: General discussion
Topic: Reading an engine's RPMs with raspberry pi
Replies: 20
Views: 1220

Re: Reading an engine's RPMs with raspberry pi

Okay, unfortunately the input current is not stated in that datasheet. So I can not tell you if this is going to work for you. Also because I didn't do if for myself. I would make one that use as less as current as possible. Or if you know how much current that sensor can deliver you can design it t...
by Brandon92
Tue Jan 05, 2021 6:32 pm
Forum: General discussion
Topic: Reading an engine's RPMs with raspberry pi
Replies: 20
Views: 1220

Re: Reading an engine's RPMs with raspberry pi

Thanks Brandon92, altering the signal too much is exactly what I am trying to avoid. In a similar vein, this circuit was suggested to me: electrical diagram.JPG I am no expert though so I've been trying to make sure I understand how to wire this up. If I use this approach though there would be no n...
by Brandon92
Mon Jan 04, 2021 5:43 pm
Forum: General discussion
Topic: Reading an engine's RPMs with raspberry pi
Replies: 20
Views: 1220

Re: Reading an engine's RPMs with raspberry pi

The "problem" with a (led) optocoupler is that the leds use a reasonable amound of power (current). And I don't know if the output of that sensor can handle that. If you load the sensor to much it could be damaged and/or the output of that sensor could be change to much that your car can't...
by Brandon92
Thu Dec 31, 2020 4:12 pm
Forum: General discussion
Topic: Reading an engine's RPMs with raspberry pi
Replies: 20
Views: 1220

Re: Reading an engine's RPMs with raspberry pi

Is that tacho sensor also going to a other part of the car that control the car. When you connect something in parallel you will change the signal slightly. And if that signal is changed to much the car doesn't react to it as it should. At the Rpi side it is importend that when it crashed or somethi...
by Brandon92
Fri Dec 25, 2020 1:08 pm
Forum: Troubleshooting
Topic: How do I power a 12v device and power my pi with a 12v battery
Replies: 14
Views: 608

Re: How do I power a 12v device and power my pi with a 12v battery

The IRF520 has a maximal gate threshold voltage of 4 V and a minimum of 2 V. So it is possible that the MOSFET will not be turned on when the gate voltage is 3.3 V. When the gate voltage is 4.5 V it can switch only a current of 1 A by drain-to-source voltage of 10 V. The relay board is good if you h...
by Brandon92
Thu Dec 24, 2020 8:18 pm
Forum: Troubleshooting
Topic: How do I power a 12v device and power my pi with a 12v battery
Replies: 14
Views: 608

Re: How do I power a 12v device and power my pi with a 12v battery

Based on the first post I purchased some MOSFETs and tried that route. I did run into some issues though and I could not seem to get power to my MOSFET, before determining my issue I did try using just the 12v relay and no MOSFET and that seems to have worked, so I ended up abandoning the MOSFET al...
by Brandon92
Sat Nov 14, 2020 9:44 pm
Forum: Troubleshooting
Topic: Polyfuse problem
Replies: 8
Views: 449

Re: Polyfuse problem

So, I tried with other meter and the reading seems to be similar, I'm using a power supply that reads 5.1v now but the polyfuse seems to be getting worse since now it measures 1.3 ohms after being off for a bit During this measurement, did you include the resistance of the probes that you are using...
by Brandon92
Sat Nov 14, 2020 9:18 pm
Forum: Other projects
Topic: Raspberry PI 3B+ LiPo autonomous system
Replies: 8
Views: 531

Re: Raspberry PI 3B+ LiPo autonomous system

It looks like you LiPo has an additional PCB. This looks like it has a built in protection circuit. Do you have more information about the battery itself. Maybe the battery has all the protection it needs.
by Brandon92
Sat Nov 14, 2020 5:58 pm
Forum: Other projects
Topic: Raspberry PI 3B+ LiPo autonomous system
Replies: 8
Views: 531

Re: Raspberry PI 3B+ LiPo autonomous system

You indeed mis the protection that is necessary for a LiPo battery. I could type a long story about it, but this youtube movie covers a lot of it: https://youtu.be/osfgkFyq7lA
by Brandon92
Tue Nov 10, 2020 9:13 pm
Forum: Troubleshooting
Topic: Polyfuse problem
Replies: 8
Views: 449

Re: Polyfuse problem

The voltage at the back of the polusfuse is not telling much if the input voltage is not known. When the power is of you could measure the resistance of the polyfuse. Depending on the value of the resistance you can tell if that part is damaged. And a polyfuse is not the same as a resistor. So you n...
by Brandon92
Fri Nov 06, 2020 7:25 pm
Forum: Beginners
Topic: About electronic components
Replies: 6
Views: 348

Re: About electronic components

It depends on where you live, but here are some examples:
  • Farnell
  • Digi-key
  • Mouser
  • LCSC
But you can also get them from Alibaba and Ebay, but some parts could be fake.
by Brandon92
Sun Nov 01, 2020 8:27 pm
Forum: Compute Module
Topic: CM3 - 8 Relay Board - I2C
Replies: 4
Views: 340

Re: CM3 - 8 Relay Board - I2C

Yes. You could indeed do something like that. Another option would be to buy a female connector and solder the resistors to that connector, but you can also solder it directly onto the parts you have. Make sure that when you bend the resistor by accident it can not touch the other pins (metel).
by Brandon92
Sun Nov 01, 2020 4:07 pm
Forum: Troubleshooting
Topic: Unstable response from motor encoder.
Replies: 2
Views: 175

Re: Unstable response from motor encoder.

The issie could be that the Rpi can not do a real time measurement. What I mean with that is that the operation software is also doing other stuff on the background. And it might take a while to process the input change.
by Brandon92
Sun Nov 01, 2020 3:57 pm
Forum: Compute Module
Topic: CM3 - 8 Relay Board - I2C
Replies: 4
Views: 340

Re: CM3 - 8 Relay Board - I2C

Are there pull up resistor on both I2C data line. You could measure this with a multimeter, by measuring the voltage on those pins. If the voltage is 3,3V then there is a pull up resistor.
by Brandon92
Fri Oct 30, 2020 7:09 pm
Forum: Automation, sensing and robotics
Topic: Attaching a TSIC 306 sensor produces a 'short' or shuts off the Pi
Replies: 19
Views: 1149

Re: Attaching a TSIC 306 sensor produces a 'short' or shuts off the Pi

drgeoff wrote:
Fri Oct 30, 2020 6:47 pm
Incorrect. Although there are other models that have analogue output the TSIC306 (and other x06 ICs covered by https://www.ist-ag.com/sites/default/files/attsic_e.pdf) is digital output (ZacWire) only.
Your are correct, my mistake. Did read the datasheet a bit to fast.
by Brandon92
Fri Oct 30, 2020 3:59 pm
Forum: Automation, sensing and robotics
Topic: Attaching a TSIC 306 sensor produces a 'short' or shuts off the Pi
Replies: 19
Views: 1149

Re: Attaching a TSIC 306 sensor produces a 'short' or shuts off the Pi

phario wrote:
Wed Oct 21, 2020 8:08 pm
This is strange. I bought a [TSIC 306 sensor](http://www.farnell.com/datasheets/1792637.pdf).
What is the exact type that you ordered. Because that ic has a couple of option on what the output signal is: digital or analog.
by Brandon92
Thu Oct 29, 2020 7:14 pm
Forum: Automation, sensing and robotics
Topic: About sensors
Replies: 6
Views: 508

Re: About sensors

Suggest me good position sensors or Vision sensors? With the brand are better? Are you paying us to answer this question. So what do you want the sensor to do. Your question is the same as: "What brand car is better for me" without any more detail/ specifications... In short, what for res...
by Brandon92
Thu Oct 29, 2020 5:21 pm
Forum: Automation, sensing and robotics
Topic: Photodiode to measure light intensity
Replies: 7
Views: 672

Re: Photodiode to measure light intensity

You could use a opamp to convert the diode current to a voltage. Analog devices has a interesting post about this with some theorie: https://www.analog.com/en/technical-art ... esign.html
by Brandon92
Fri Oct 23, 2020 9:12 am
Forum: Troubleshooting
Topic: no problem with USB. But soldering has a problem. plz help...
Replies: 5
Views: 260

Re: no problem with USB. But soldering has a problem. plz help...

toy339 wrote:
Fri Oct 23, 2020 8:22 am
Yes, the white is properly soldering.

If connection was normal, Is it recognized as usb without an internal setting?
It looks like if you soldered those 2 pads together:
RpiUsbShort.png
RpiUsbShort.png (91.91 KiB) Viewed 204 times
If it is a normal USB device it should work lik this.
by Brandon92
Fri Oct 23, 2020 5:54 am
Forum: Troubleshooting
Topic: no problem with USB. But soldering has a problem. plz help...
Replies: 5
Views: 260

Re: no problem with USB. But soldering has a problem. plz help...

Is the white cable only soldered to that round pad or also to the mounting hole next to it. Because it looks like it is also soldered to it and this will give you a problem that the USB will not work.
by Brandon92
Thu Oct 22, 2020 3:16 pm
Forum: Automation, sensing and robotics
Topic: Stepper Motor
Replies: 5
Views: 405

Re: Stepper Motor

ah ok I didn't realize hat it was 2x 1.7A. I will try and connect without using the dupont cables and breadboard then. Strangely it seemed to work a bit quicker and smoother with an Arduino (breadboard and dupont wires etc) I am using the EasyDriver Stepper Motor Controller - https://www.robotshop....
by Brandon92
Thu Oct 22, 2020 7:12 am
Forum: Automation, sensing and robotics
Topic: Connecting the high voltage and current sensors to raspberry
Replies: 1
Views: 293

Re: Connecting the high voltage and current sensors to raspberry

First of all, I assume that the output of that sensor is "save to touch". So it is galvanic isolated from the high voltage side. As you stated the output of that sensor need to connect via a ADC to the Rpi. The Rpi can only read digital signals by the way. If the output of the sensor is a ...

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