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by Brandon92
Thu Apr 18, 2019 5:27 pm
Forum: Beginners
Topic: How to calculate resistors...
Replies: 42
Views: 597

Re: How to calculate resistors...

Ehm, that is an interesting statement about the designed PCB. What I meant with that is that the connection and calculation of a led is often the "first" thing you going to learn about electronics. And designing a (correct) PCB is definitely not the easiest part of it. There are a lot of things you ...
by Brandon92
Thu Apr 18, 2019 4:57 pm
Forum: Automation, sensing and robotics
Topic: Robotics project PLEASE HELP!
Replies: 5
Views: 107

Re: Robotics project PLEASE HELP!

A portable power supply would be a battery. For example a lead acid battery or a NIMH battery from the RC world will do the job. And of course a lipo battery will work also, but you need to have some protection with it.
by Brandon92
Thu Apr 18, 2019 7:00 am
Forum: General discussion
Topic: Control powerfull pwm fans with Pi
Replies: 11
Views: 406

Re: Control powerfull pwm fans with Pi

Use a cheap L298 driver module, using a 12V power adapter for the fan (one module could handle two independent fans) If you google Raspberry Pi L298 you will find plenty of articles on driving motors like this. That will not work in this case. The fan is more than 40W and that is to much for that d...
by Brandon92
Tue Apr 16, 2019 12:58 pm
Forum: Nederlands
Topic: servo motor project met rpi3
Replies: 1
Views: 63

Re: servo motor project met rpi3

Dit is zeker te doen met een Rpi. Al zal ik hier zelf niet de Rpi3 voor gebruiken maar een zero. Die verbruikt minder stroom en is meer dan voldoende voor deze toepassing. Sterker nog een arduino met een RTC of één van de ESP serie is hier al voldoende voor. En verbruiken vele malen minder stroom. H...
by Brandon92
Sun Apr 14, 2019 6:15 pm
Forum: General discussion
Topic: Connecting a tactile switch
Replies: 28
Views: 854

Re: Connecting a tactile switch

This web page (Protecting Inputs in Digital Electronics) gives a lot of information about how you could use a switch over a long wire. And Figure 4 shows why you get more than one trigger and the (hardware) solution is discussed there.
by Brandon92
Sat Apr 06, 2019 1:10 pm
Forum: Troubleshooting
Topic: 3v gpio header pin reading 5v
Replies: 3
Views: 61

Re: 3v gpio header pin reading 5v

You need to give more information about your setup. Like the parts that you are using and how you connected everything together. A picture would also be very helpful.
by Brandon92
Thu Apr 04, 2019 2:49 pm
Forum: Automation, sensing and robotics
Topic: Know where I can get reasonably priced DPST/DPDT 240v/8a to 240v/10a relays?
Replies: 15
Views: 481

Re: Know where I can get reasonably priced DPST/DPDT 240v/8a to 240v/10a relays?

I don't disbelieve the price of electronic parts, I have an issue with the logic of pay a lot so you don't burn your house down as opposed to cost to manufacture and sell at a reasonable price. If you are content to buy them based on the fact that they won't burn your house down - then why not sell...
by Brandon92
Wed Apr 03, 2019 5:53 pm
Forum: General discussion
Topic: 3.3v Relay Exists?
Replies: 7
Views: 272

Re: 3.3v Relay Exists?

while you dont want to hear it, a relay isnt the best component to switch a small dc load, your much better off looking at a mosfet solution. a relay is an AC switching component . I do not fully agree with this statement. A relay is also commonly used in the automotive industrie. For example, ther...
by Brandon92
Wed Apr 03, 2019 10:04 am
Forum: Nederlands
Topic: RS232 comunicatie
Replies: 2
Views: 253

Re: RS232 comunicatie

Wat heb je allemaal geprobeerd dan?
Had je hier al na gekeken: https://pyserial.readthedocs.io/en/late ... intro.html hier staan wel een paar voorbeelden in.
by Brandon92
Fri Mar 29, 2019 3:24 pm
Forum: Troubleshooting
Topic: 5V on test points but still undervoltage lightning bolt
Replies: 15
Views: 431

Re: 5V on test points but still undervoltage lightning bolt

euroeuro wrote:
Fri Mar 29, 2019 2:43 pm
I checked the power supply with an oscilloscope and there were no sudden drops below 4.8V.
I upgraded to a thicker cable now, but nothing changed.
Maybe a stupid question, but how did you measure it? Did you set the (single) trigger to a falling edge and <4,8v.
And what is an thicker cable?
by Brandon92
Fri Mar 29, 2019 2:05 pm
Forum: Troubleshooting
Topic: 5V on test points but still undervoltage lightning bolt
Replies: 15
Views: 431

Re: 5V on test points but still undervoltage lightning bolt

5.4V is indeed too high of a voltage. There could be a couple issues here: Do you have the latest update installed Is your 5V powersupply from good quality, so that it will not drop to much in voltage when the load is changing What are you using as a wire, if it is to thin there is a to much voltage...
by Brandon92
Thu Mar 28, 2019 9:26 pm
Forum: Automation, sensing and robotics
Topic: Mechanical unit automation
Replies: 7
Views: 312

Re: Mechanical unit automation

I would advice you to take a look to Siemens LOGO 8. You can program it daily what it need to do and it comes with all the required certifications.
by Brandon92
Thu Mar 28, 2019 4:17 pm
Forum: Beginners
Topic: Help with surveillance system
Replies: 4
Views: 195

Re: Help with surveillance system

The resistors you are mentioning, would you use the same for the position light, flood light and the siren? I have 4 IRF520 mosfets, will they suit my needs? it says in the datasheet that they have a min VGS(th) of 2v and max 4v. Yes you can use the same setup for the other loads. It is wise to add...
by Brandon92
Wed Mar 27, 2019 3:09 pm
Forum: Beginners
Topic: Help with surveillance system
Replies: 4
Views: 195

Re: Help with surveillance system

Welcome, Your diagram looks good and should work as you want. In you case I would choose a transistor that can switch at least 5A or more. And a MOSFET could be a better choose for you instead of a transistor. And this MOSFET can also switch the other loads. (Another solution could be a relay.) And ...
by Brandon92
Wed Mar 27, 2019 12:39 pm
Forum: For sale
Topic: Raspberry Pi Zero smart watch kickstarter
Replies: 7
Views: 1762

Re: Raspberry Pi Zero smart watch kickstarter

Did you calculate the battery life of this product. And is that time enough for the user?
by Brandon92
Wed Mar 27, 2019 9:55 am
Forum: Troubleshooting
Topic: MCP23s17 issues!
Replies: 3
Views: 109

Re: MCP23s17 issues!

Did you set this bit correctly? Otherwise they have the same address. The MCP23S17 is a slave SPI device. The slaveaddress contains four fixed bits and three user-definedhardware address bits (if enabled via IOCON.HAEN)(pins A2, A1 and A0) with the read/write bit filling outthe control byte. Figure3...
by Brandon92
Mon Mar 25, 2019 4:00 pm
Forum: HATs and other add-ons
Topic: Interfacing with another system running 5 volts
Replies: 6
Views: 244

Re: Interfacing with another system running 5 volts

You could run that other system at a lower voltage. But that is maybe not possible.

You need a voltage divider to lower the 5v to a save voltage. This will require two resistors. You could also use a level shifter.
by Brandon92
Fri Mar 22, 2019 11:06 pm
Forum: Troubleshooting
Topic: GPIO pins for I2C defective?
Replies: 2
Views: 91

Re: GPIO pins for I2C defective?

When you did connect it wrong. What did you connect to the I2C pins?
You could try if you can light up a led and also if you can read the state of that gpio pin. But, I think you need to buy a new one if everything is connected correctly and worked before.
by Brandon92
Fri Mar 22, 2019 5:16 pm
Forum: Automation, sensing and robotics
Topic: electric dog collar based on radio waves
Replies: 13
Views: 319

Re: electric dog collar based on radio waves

I think the Rpi is not really suitable for this task, power consumption, not fail prove, ect..

There are also other things you need to consider, and a lot more, what happens when the "base station" goes down (power loss)
by Brandon92
Fri Mar 22, 2019 4:16 pm
Forum: Automation, sensing and robotics
Topic: electric dog collar based on radio waves
Replies: 13
Views: 319

Re: electric dog collar based on radio waves

I would also not start this project and it is already discussed why. But also for a other reason, there (could) be a lot of energy be discharged very fast. And this "signal" can destort/damage your control electronics and in the worst case the collar stays on... So, train your dog probably and I bel...
by Brandon92
Thu Mar 21, 2019 7:53 am
Forum: Beginners
Topic: Hall effect sensor with electricity cables
Replies: 5
Views: 194

Re: Hall effect sensor with electricity cables

Don't you have a link where you did buy it or a link to the datasheet.
by Brandon92
Wed Mar 20, 2019 5:12 pm
Forum: Troubleshooting
Topic: SPI Burnt
Replies: 4
Views: 113

Re: SPI Burnt

Yes, that could do the job. If you didn't damage the Rpi GPIO pin.
by Brandon92
Tue Mar 19, 2019 11:17 pm
Forum: Python
Topic: SPI Problem between Mega 2560 and Raspberry Pi
Replies: 4
Views: 127

Re: SPI Problem between Mega 2560 and Raspberry Pi

My first thoughts.
How did you connect them, because the arduino works on 5v and the Rpi on 3.3v. And that is also the maximum input voltage of the Rpi.
(I didn't look at the code)
by Brandon92
Tue Mar 19, 2019 2:46 pm
Forum: General discussion
Topic: multiple displays
Replies: 3
Views: 148

Re: multiple displays

The screen use a hd44780 driver. And if you type that in Google with the raspberry pi you find a lot of tutorials :D
by Brandon92
Tue Mar 19, 2019 2:24 pm
Forum: Beginners
Topic: Why my IR LED transmitter not transmit any signal?
Replies: 43
Views: 1188

Re: Why my IR LED transmitter not transmit any signal?

I did directly connecting it to 5v before, but I have fix it by the time someone told me to put the resistor. Okay, this could have destroyed your led. And you need to buy a one one. Yup, I have tried it just now, and my Red LED is lighting, but my IR LED not. This could mean two things, your IR le...

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