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Rpi SE Chat Record

2dfollowed question — closedRaspberry Pi 4B – RFID-RC522 stopped working
Nov
29
commentMax30102 not visible in i2cdetect
@tlfong01 thanks but I’ve already seen these questions. In both the connection is already est…
Nov
28
followed question — commentRaspberry Pi 4B – RFID-RC522 stopped working
Ok, my bad! It works! I checked again the connections, and… I shifted everything by one pin fac…
Nov
28
followed question — commentRaspberry Pi 4B – RFID-RC522 stopped working
I tried with a freshly installed RPi, and I got the same problem 😦 I don’t know why it stopp…
Nov
28
commentCan you use the Rpi compute module CM4 without the IO board?
@tlfonh01 Yes, I do too. I just need the module for the size and the lack of ports.
Nov
24
followed question — commentRaspberry Pi 4B – RFID-RC522 stopped working
Is there a way to reinstall the SPI module properly, if it’s the problem? I tried to add a pu…
Nov
22
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: Hi again! Really interesting topic for me… Do you have Flash player? If so, …
Nov
20
commentRaspberry Pi 4B – RFID-RC522 stopped working
Thanks a lot @tlfong01 ! I’ll following your guidelines and checking everything. I hope it…
Nov
20
followed question — commentRaspberry Pi 4B – RFID-RC522 stopped working
Thanks @joan for your softwares. I could check the signals, and it looks like I sending data. I j…
Nov
20
commentMechanics required for a stepper motor
Thanks @tlfong01 for the welcome and for the buying advice. I find them really useful.
Nov
20
commentTHM3060 RFID reader setup issues
Hi. Sorry for late reply. Im afraid i dont have an updated version of the user guide. Only the on…
Nov
19
moderator messageElectrical Engineering Stack Exchange Moderators
Hello, We’re writing in reference to your Electrical Engineering Stack Exchange account: https://…
Nov
19
commentLevel sensor Transmitter
@tlfong01,Got model number and it is QDY60A 4-20mA liquid level transmitter. Thank you for helpin…
Nov
17
commentHow to calculate pull-down resistor resistance
Thanks mate, this is helpful too.
Nov
17
commentUse of a three wire load cell
@tlfong01, I have recently discovered that these load cells that I have are deemed …
Nov
17
commentLevel sensor Transmitter
@tlfong01.. For now I dont’t have the model number. Only I can see some values written on tra…
Nov
17
commentSIM 7600ei AT command error while sending GET request
@tlfong01 thank you for responding. As you can see in the screenshot the module has successfully …
Nov
17
commentEC and pH sensor in plc automation
@tlfong01, I have switch ON pH sensor at a time keeping EC sensor OFF. Then after some delay swit…
Nov
17
commentHow to troubleshoot a DRV8833 motor driver module problem?
fyi – See brhans answer as confirmed in Onur Celebi’s answer where he confirms that floating …
Nov
17
commentHow to calculate pull-down resistor resistance
@tlfong01 Thanks for this! I will take a look.
Nov
14
commentPCA9685 Raspberry pi4B i2c errors
@tlfong01 the wires are less than 5 cm in length, And sure the fact that I have 40 and 70 registe…
Nov
13
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: @tlfong01, Thanks for the wisdom. I think here “prophets” are not on…
Nov
13
commentNegative resistance from MOSFET circuit
@tlfong01, Thanks for the valuable links. We can name this circuit “artificial tunnel diode…
Nov
13
commentWhere do I find good IV curves?
@tlfong01 I remember when Blue LEDs first became available and they cost 200x more than a Red LED…
Nov
13
commentWhere do I find good IV curves?
@tlfong01, it’s linear and easy. \$ V_C = IZ_C \$ and \$ V_L = IZ_L \$.
Nov
13
commentWhere do I find good IV curves?
@tlfong01, you don’t need IV curves for RLC components because they are linear. You need them…
Nov
12
commentI2C device detected on arduino but not on raspberry pi 4
I have the module installed but currently my tests are over the normal SDA and SCL pins of both t…
Nov
12
commentI2C device detected on arduino but not on raspberry pi 4
Yes, actually I did some further digging and took an old r-pi 3 and inserted my sd card that I us…
Nov
11
commentDRV8871 (DC-Motor Driver) extremely reduced output voltage
@tlfong01 I’ve probed with motors resistors and nothing connected to the PWM-X pins but the i…
Nov
11
commentReading multiple RFID tags at the same time
Thanks @tlfong01 it does give much insight on the components I’ve researched so fare
Nov
10
commentPi 4B wifi can only use channels legal in China
@tlfong01 On my Pi4 w/Buster, 5GHz WiFi worked out of the box. Could the problem be in your router?
Nov
9
commentOverheating of L293D
@tlfong01 the L298 is only barely better than the 293. Both are terrible and fully obsolete by eq…
Nov
9
commentShare Uart Pins
Or wear a fireproof suit. Bleeding edge can be OK if work funds the research and time 🤭
Nov
9
commentShare Uart Pins
Waveshare use the 752 (thepihut.com/products/…) as does this dual port tindie.com/products…
Nov
8
commentReplace Relay with NC Solid State Switch
@tlfong01 are there any with high enough amp rating that are NC? I couldn’t find any that wer…
Nov
7
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: @tlfong01, I don’t know why but I can’t reply to a specific message fr…
Nov
5
commentWhat are the various LIDAR components that can be used on a Raspberry and interracted with using Python?
I appreciate this, and found the CE30 quite interesting, however a resolution of 320 points is no…
Nov
3
commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriver
no they were there originally, i just edited a small mistake i made with the pwm.set_pwm_freq lin…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: Regarding Sparkfun op-amp tutorial… Look at the inverting amplifier. Do you …
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: 24-bit ADC sounds fantastic. I just can’t imagine such a resolution. But I…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: These op-amp resources are good but standard. I need more in-depth explanation…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: I got a good idea of you. I have always been interested in how programming com…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: Saying “philosophical” I mean “conceptual”, “generali…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: I know I have to use simulating software but I do not use it for a variety of …
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: To “(1) He knows the answer already, but does not want to tell. If that i…
Nov
2
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: @tlfong01, I am beginning to respond consistently to your comments because tod…
Nov
2
commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriver
The two lines you mentioned are at the top of the code that I posted, and I am using pwm.set_pwm(…
Nov
2
commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriver
hello! I used this tutorial and simply edited it. can you tell me which part you believe may be c…
Nov
1
commentHow to properly use a relay module with JD-VCC from Arduino/Raspberry?
@tlfong01, I am preparing an answer in the chat but will say something here. Your specific answer…
Oct
31
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01, I decided to watch the “open collector” movie of RSD Academy but I was very …
Oct
31
commentHow to properly use a relay module with JD-VCC from Arduino/Raspberry?
I enjoyed reading this detailed and well-written Arduino story. I just want to remind you that th…
Oct
31
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: @tlfong01, First, about you… Today I read your answer about “JD-Vcc relay…
Oct
31
chat replyDiscussion between tlfong01 and Circuit fantasist
Circuit fantasist: @tlfong01, Again, I find that you are a very interesting person… not so typi…
Oct
30
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01, Very interesting… I am glad there are people like you (and me:) here… and they hav…
Oct
30
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01, You are an interesting person with this “philosophical” reasoning… I see s…
Oct
30
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01, My answer was more general – about a multistage amplifier, where the output collector-…
Oct
29
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01, Where do you get this unbridled imagination from? And that subtle sense of humor? Mayb…
Oct
29
commentUsing a PNP over an NPN to activate a solenoid
@tlfong01 Please stop answering in the comment section. The warnings and policy is there for a re…
Oct
29
commentUsing a PNP over an NPN to activate a solenoid
Ah stupid me didn’t even register the solenoid wasn’t grounded by default, thanks! Also @…
Oct
26
commentHow to run 2 load cells each with a HX711 on Rpi
@tlfong01 the GPIO.setmode is done in HX711.py which is called in example.py and mode is set to B…
chat replyDiscussion on question by MollyMal: Load sensor – to sense/track a ball movement
MollyMal: @tlfong01 how would you transfer readings to smart phone? That sounds interesting
Oct
24
commentDo I have to consider the wire gauge of common return?
@tlfong01 The 1A was just to help me ask and understand the greater concept of a common return. T…
Oct
24
commentProtecting circuit from piezoelectric disc voltage spike
@tlfong01 In your cited answer you said “Conclusion: Zener diode is absolutely necessary!…
Oct
24
commentHow exactly does a basic EMF sensor work?
@tlfong01 no, the LED is not connected to the input. only an antenna is connected there.
Oct
23
commentSMPS powered DC motor inrush current problem
@tlfong01 This is why I asked about the L1 value as I have no idea how to choose the right value.
Oct
23
commentSMPS powered DC motor inrush current problem
@tlfong01 I’ve just found another solution that might work for you as well. I haven’t tes…
Oct
22
commentHow does this two transistor circuit work?
@tlfong01, please don’t forget that comments are for seeking clarification on questions or an…
Oct
22
commentHow does this two transistor circuit work?
@tlfong01 I dont understand what you are talking about. are you suggesting a circuit like this wo…
Oct
22
commentLCD Viewing angle for 8 COM vs 4 COM
@tlfong01 I think you’re going in wrong direction. The COM pins are to multiplex the clock to…
Oct
22
commentLCD Viewing angle for 8 COM vs 4 COM
@tlfong01 No need for apologies mate. Just let me know what issues I might encounter, when going …
Oct
21
commentProtecting circuit from piezoelectric disc voltage spike
@tlfong01 No, we are not solving inrush current here!
Oct
21
commentProtecting circuit from piezoelectric disc voltage spike
@tlfong01 question about the 1M resistor/zener circuit in practice. It was my understanding that …
Oct
21
commentAm I a weak Electronic Engineer?
@tlfong01, Thanks, your answer explains a lot.
Oct
21
commentProtecting circuit from piezoelectric disc voltage spike
I’m affraid you misunderstood the reason for NTC in that inrush limiting circuit. There is ab…
Oct
21
commentLCD Viewing angle for 8 COM vs 4 COM
@tlfong01 you’re not helping. I am not sure if you have any questions..
Oct
21
commentProtecting circuit from piezoelectric disc voltage spike
Uh, \$m\Omega \ne M\Omega\$
Oct
21
commentProtecting circuit from piezoelectric disc voltage spike
Could you please, please try to post straightforward answers that simply make your point without …
Oct
20
commentLCD Viewing angle for 8 COM vs 4 COM
@tlfong01 It is clearly about segmented LCD.
Oct
18
commentWhy is resistor needed in ADC circuit
Hello @tlfong01, yes, it is a 3-bit ADC, it comes from the 8 different values that are distinguis…
Oct
17
commentN-MOSFET Gate to Drain short and Vgs
For a detailed answer, you should start a new question. In short, measuring Vth with gate and dra…
commentHow to remotely turn off the cooling fan of an already software shut down Rpi?
this is really exhaustive, would be great if you can summarize and cut out the fat or at least in…
Oct
17
commentN-MOSFET Gate to Drain short and Vgs
Why does the gate to source voltage become equal to gate to drain voltage, when shorted from gate…
Oct
16
commentPowering Raspberry PI 4 from powerbank
@tlfong01 the RPI4 requires 5V 3A is it ok?
Oct
15
commentDS18B20 stopped recently
Thx again @tlfong01! Your suggestion (3) worked!! I used Aug Buster image & enabled only 1-wi…
Oct
15
commentDS18B20 stopped recently
Thx @tlfong01! (1) Understand your suggestion rather well owing to the challenges in reading DHTx…
Oct
14
commentHow can I increase the output current to make it sufficient for relay module?
@tlfong01 Thank you very much for help. It is really useful. I will try to modify the circuit aga…
Oct
13
commentHow to do odometry for 4 mecanum wheeled robot?
yes @tlfong01, I am referring to the robot you’ve attached in the link. Is it possible to do …
Oct
11
commentDC motor with motor driver included
@tlfong01 please do not recommend the L298, it is an ancient, horribly lossy part. New projects …
Oct
10
commentCan’t transmit UART signal from Circuit Playground Express to Raspberry Pi witth 433MHz rf link kit
@tlfong01 this does not appear to be about an SPI radio. It is most certainly not about an nRF24…
Oct
8
commentHow can I use a 2N2222 transistor as a temperature sensor?
Let’s not discuss and simply say what range and accuracy specs 1st? Room temp or outdoor 0~70’Cor…
Oct
8
commentHow can I use a 2N2222 transistor as a temperature sensor?
actually the tempco increases from -2.0 to -2.2 as the current is reduced to 1uA. Any self heatin…
Oct
8
commentHow can I use a 2N2222 transistor as a temperature sensor?
I don’t consider any of those YT’s video’s as expert design references
Oct
8
commentHow can I use a 2N2222 transistor as a temperature sensor?
but great effort
Oct
8
commentHow can I use a 2N2222 transistor as a temperature sensor?
When you combine a fairly accurate – 2.2mV/’C NTC characteristics of the Vbe with base-colle…
Oct
7
commentSerial (RS232) Controled Projector
@tlfong01 I have shorted it on the converter, but am unsure how to short it on the pi. How would …
Oct
6
commentHow can I use a 2N2222 transistor as a temperature sensor?
@tlfong01, What’s the weather like in your city today? Have you tried the thermometer?
Oct
6
commentHow can I use a 2N2222 transistor as a temperature sensor?
Also note that the OP thought that the TMP36 was comparable to a 2N2222 so most of this is probab…
Oct
6
commentHow can I use a 2N2222 transistor as a temperature sensor?
@tlfong01 Please keep your edits to a minimum and your answers a bit shorter, the answers are a b…
Oct
5
commentHow can I use a 2N2222 transistor as a temperature sensor?
tlfong, my opinion is that the pn2n2222 was created for the Japanese market (I have no hard evide…
Oct
5
chat replyDiscussion between tlfong01 and Adrian Maire
Adrian Maire: I created a community answer, so it is more a “joined” answer than “…

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