Well, I disagree with this answer. This device is not fully save* to use it in this case. And I will give a detailed explanation in a couple of hours, why (I think) this is the case.
Search found 869 matches
- Thu Sep 13, 2018 2:40 pm
- Forum: General discussion
- Topic: MCP3008 readings
- Replies: 163
- Views: 13776
Re: MCP3008 readings
- Thu Sep 13, 2018 1:52 pm
- Forum: General discussion
- Topic: MCP3008 readings
- Replies: 163
- Views: 13776
Re: MCP3008 readings
2. sensor can sense AC or DC current so if i replace DC battery with AC main Is that circuit capable to measure AC current ? I think circuit can measure both AC and DC current I don't need any extra part to measure AC current Before I answer that question. What is the mains voltage that you are usi...
- Wed Sep 12, 2018 8:57 pm
- Forum: HATs and other add-ons
- Topic: Powering Pi from 3S lipo with LM2596 step-down converter
- Replies: 8
- Views: 2237
Re: Powering Pi from 3S lipo with LM2596 step-down converter
I'm not 100% what you are asking.
But if you are using a LM2596, the output voltage should not change much if the voltage at the input is changing.
- Wed Sep 12, 2018 8:40 pm
- Forum: Python
- Topic: GPIO.input voltage levels vs edge detection
- Replies: 430
- Views: 79290
Re: GPIO.input voltage levels vs edge detection
When you use a "transfer board" with the correct IC. Its not a only a solution for a hobbyists. But also easy for testing a IC on your breadboard. Without buying / making a pcb.
- Wed Sep 12, 2018 8:37 pm
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
To give a little bit more detail about the ESD: When you sitting on a chair (with urenthane foam) you are charged to arround the 18000V and when you walk on a carpet you have a charge of 35000V. And when you are touching a pin of a IC (or other parts) they are triggered, because the charge that you ...
- Wed Sep 12, 2018 8:22 pm
- Forum: Automation, sensing and robotics
- Topic: How to read motor's tach out open collector
- Replies: 25
- Views: 5253
Re: How to read motor's tach out open collector
Good to see that you find the solution.
But, does the zener protect you input of your fan? If the voltage is higher than 12V. You can check it by adjusting the V2 voltage source to 15V and see what happens
But, does the zener protect you input of your fan? If the voltage is higher than 12V. You can check it by adjusting the V2 voltage source to 15V and see what happens
- Wed Sep 12, 2018 12:48 pm
- Forum: Automation, sensing and robotics
- Topic: Relay Module KY-019 5V
- Replies: 488
- Views: 103949
Re: Relay Module KY-019 5V
If I was you, I would start if it theoretical possible what you want to do. Before you start programming.
By this I mean, make a timing diagram. And check if everything is fast enough to detect and save the incoming data from the sensor.
By this I mean, make a timing diagram. And check if everything is fast enough to detect and save the incoming data from the sensor.
- Tue Sep 11, 2018 6:42 pm
- Forum: Beginners
- Topic: Raspberry(3b+)-PCA9685-12V Fans
- Replies: 73
- Views: 7909
Re: Raspberry(3b+)-PCA9685-12V Fans
Do you have perhaps other transistor to test with? Or did you try to lower the base transistor?
- Tue Sep 11, 2018 3:19 pm
- Forum: Python
- Topic: GPIO.input voltage levels vs edge detection
- Replies: 430
- Views: 79290
Re: GPIO.input voltage levels vs edge detection
The hobbist won't study the pro coder's program for now, but might verify his conclusion using hobbyist tricks. Anyway, it seems safe to follow the brave guy now, because he has not fried any Rpi yet :) . Actually, I very much like the MCP23017. Not only does it protect the pi but as it can indepen...
- Tue Sep 11, 2018 2:19 pm
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Ehm okay, can you give a (detailed) explanation how you get this error? And is this error still present when you add a switch?
- Tue Sep 11, 2018 1:25 pm
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Do you own a multimeter?
If this is the case. Can you measure the voltage at each pin? From the MCP its ground.
Then you can measure if the pull up inside the MCP is working. And you can also test if each pin has the correct voltage applied to it.
If this is the case. Can you measure the voltage at each pin? From the MCP its ground.
Then you can measure if the pull up inside the MCP is working. And you can also test if each pin has the correct voltage applied to it.
- Tue Sep 11, 2018 8:51 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
What did you try.
Also, in this topic, the last pages, they talk about the interrupt function of that chip. And it has some issues with it, maybe interesting to take a look at.
Also, in this topic, the last pages, they talk about the interrupt function of that chip. And it has some issues with it, maybe interesting to take a look at.
- Tue Sep 11, 2018 8:31 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
This could also be a part of your problem (What is Switch Bounce)
- Tue Sep 11, 2018 7:09 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Okay, maybe its a good idea for you. To write some comments by your code. So, we can read what you are trying to do.fisherijus wrote: ↑Tue Sep 11, 2018 6:59 ami say should cause outputs work like a charmso with the connectivity should be no problem.
i will be waiting for your feedback about the code.. thank you!
- Tue Sep 11, 2018 6:47 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Okay. Are you 100% its ok, because you say "should" 
.
Maybe there is something wrong with you code. And to setup the internal in the MCP. I will take a look tonight at your code, if someone else didn't do it already.
.Maybe there is something wrong with you code. And to setup the internal in the MCP. I will take a look tonight at your code, if someone else didn't do it already.
- Tue Sep 11, 2018 6:25 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
It it possible that you show us a picture of both sides of the MCP. Because I can see that you change some wires.
By the way, did you check if there is a solid connection between the pin of the mcp and the Rpi. Because, sometimes those wires are broken or bad. As I know from experience.
By the way, did you check if there is a solid connection between the pin of the mcp and the Rpi. Because, sometimes those wires are broken or bad. As I know from experience.
- Mon Sep 10, 2018 7:50 pm
- Forum: Troubleshooting
- Topic: Raspberry PI 3 "Under Voltage"
- Replies: 22
- Views: 6333
Re: Raspberry PI 3 "Under Voltage"
What for voltage do you measure at the 5V and ground pin located at the Rpi? And does you power supply need to have a minimum load? Because that information is missing at they product page. High grade stuff... 22 AWG High Gauge Low Impedance wire. Thats sounds like a ebay product description :? 8-)
- Mon Sep 10, 2018 7:24 pm
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Well it did not work..i tried to power mcp with 3.3v but it did not solve the problem...still receive those fake interrupts...no idea whats going on... Ehm, okay. Its a little bit hard to see, but did you connect the ground to pin 10? Because it's looks like there is no wire there. And what is the ...
- Mon Sep 10, 2018 5:50 pm
- Forum: Beginners
- Topic: Raspberry(3b+)-PCA9685-12V Fans
- Replies: 73
- Views: 7909
- Mon Sep 10, 2018 1:06 pm
- Forum: General discussion
- Topic: MCP3008 readings
- Replies: 163
- Views: 13776
Re: MCP3008 readings
Measure the voltage that is present at the output of your ASC sensor. Then you can also calculate by hand what the expected current is. After that you can also calculate what the ADC output is. And how you can convert that value. Maybe there is some mistake down that line.
- Mon Sep 10, 2018 12:11 pm
- Forum: Beginners
- Topic: I2C & GPIO
- Replies: 1
- Views: 127
Re: I2C & GPIO
If you are using the I2C data bus. You are free to use the other GPIO pins. But, the pins that are dedicated for the I2C, you can't use them for other task.
- Mon Sep 10, 2018 11:14 am
- Forum: General discussion
- Topic: MCP3008 readings
- Replies: 163
- Views: 13776
Re: MCP3008 readings
Don't you have a extra USB cable lie around, where can cut the other end of?
- Mon Sep 10, 2018 9:14 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
Yes, you should try that. But, remember that the maximal input voltage is equal to the supply voltage.
- Mon Sep 10, 2018 9:07 am
- Forum: Beginners
- Topic: [SOLVED] pir motion detection
- Replies: 8
- Views: 517
Re: pir motion detection
I found this youtube video very helpful for this question.
- Mon Sep 10, 2018 8:05 am
- Forum: Troubleshooting
- Topic: MCP23017 interrupts
- Replies: 41
- Views: 2553
Re: MCP23017 interrupts
The problem might be coming from that you connected the MCP23017 to a 5V power rail. This result in that the that the chip his input high voltage is set to 4V, for a stable connection. And your voltage is ideal 3.3V, but might be even lower. So this could result in that you think you set some settin...