Uncategorized Rpi SE Chat Record By tlfong01 on December 3, 2020 • ( Leave a comment ) 2dfollowed question — closedRaspberry Pi 4B – RFID-RC522 stopped workingNov29commentMax30102 not visible in i2cdetect@tlfong01 thanks but I’ve already seen these questions. In both the connection is already est…Nov28followed question — commentRaspberry Pi 4B – RFID-RC522 stopped workingOk, my bad! It works! I checked again the connections, and… I shifted everything by one pin fac…Nov28followed question — commentRaspberry Pi 4B – RFID-RC522 stopped workingI tried with a freshly installed RPi, and I got the same problem 😦 I don’t know why it stopp…Nov28commentCan 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.Nov24followed question — commentRaspberry Pi 4B – RFID-RC522 stopped workingIs there a way to reinstall the SPI module properly, if it’s the problem? I tried to add a pu…Nov22chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: Hi again! Really interesting topic for me… Do you have Flash player? If so, …Nov20commentRaspberry Pi 4B – RFID-RC522 stopped workingThanks a lot @tlfong01 ! I’ll following your guidelines and checking everything. I hope it…Nov20followed question — commentRaspberry Pi 4B – RFID-RC522 stopped workingThanks @joan for your softwares. I could check the signals, and it looks like I sending data. I j…Nov20commentMechanics required for a stepper motorThanks @tlfong01 for the welcome and for the buying advice. I find them really useful.Nov20commentTHM3060 RFID reader setup issuesHi. Sorry for late reply. Im afraid i dont have an updated version of the user guide. Only the on…Nov19moderator messageElectrical Engineering Stack Exchange ModeratorsHello, We’re writing in reference to your Electrical Engineering Stack Exchange account: https://…Nov19commentLevel sensor Transmitter@tlfong01,Got model number and it is QDY60A 4-20mA liquid level transmitter. Thank you for helpin…Nov17commentHow to calculate pull-down resistor resistanceThanks mate, this is helpful too.Nov17commentUse of a three wire load cell@tlfong01, I have recently discovered that these load cells that I have are deemed …Nov17commentLevel sensor Transmitter@tlfong01.. For now I dont’t have the model number. Only I can see some values written on tra…Nov17commentSIM 7600ei AT command error while sending GET request@tlfong01 thank you for responding. As you can see in the screenshot the module has successfully …Nov17commentEC 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…Nov17commentHow to troubleshoot a DRV8833 motor driver module problem?fyi – See brhans answer as confirmed in Onur Celebi’s answer where he confirms that floating …Nov17commentHow to calculate pull-down resistor resistance@tlfong01 Thanks for this! I will take a look. Nov14commentPCA9685 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…Nov13chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: @tlfong01, Thanks for the wisdom. I think here “prophets” are not on…Nov13commentNegative resistance from MOSFET circuit@tlfong01, Thanks for the valuable links. We can name this circuit “artificial tunnel diode…Nov13commentWhere do I find good IV curves?@tlfong01 I remember when Blue LEDs first became available and they cost 200x more than a Red LED…Nov13commentWhere do I find good IV curves?@tlfong01, it’s linear and easy. \$ V_C = IZ_C \$ and \$ V_L = IZ_L \$.Nov13commentWhere do I find good IV curves?@tlfong01, you don’t need IV curves for RLC components because they are linear. You need them…Nov12commentI2C device detected on arduino but not on raspberry pi 4I have the module installed but currently my tests are over the normal SDA and SCL pins of both t…Nov12commentI2C device detected on arduino but not on raspberry pi 4Yes, actually I did some further digging and took an old r-pi 3 and inserted my sd card that I us…Nov11commentDRV8871 (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…Nov11commentReading multiple RFID tags at the same timeThanks @tlfong01 it does give much insight on the components I’ve researched so fareNov10commentPi 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?Nov9commentOverheating of L293D@tlfong01 the L298 is only barely better than the 293. Both are terrible and fully obsolete by eq…Nov9commentShare Uart PinsOr wear a fireproof suit. Bleeding edge can be OK if work funds the research and time 🤭Nov9commentShare Uart PinsWaveshare use the 752 (thepihut.com/products/…) as does this dual port tindie.com/products…Nov8commentReplace 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…Nov7chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: @tlfong01, I don’t know why but I can’t reply to a specific message fr…Nov5commentWhat 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…Nov3commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriverno they were there originally, i just edited a small mistake i made with the pwm.set_pwm_freq lin…Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: Regarding Sparkfun op-amp tutorial… Look at the inverting amplifier. Do you …Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: 24-bit ADC sounds fantastic. I just can’t imagine such a resolution. But I… Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: These op-amp resources are good but standard. I need more in-depth explanation…Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: I got a good idea of you. I have always been interested in how programming com…Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: Saying “philosophical” I mean “conceptual”, “generali…Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: I know I have to use simulating software but I do not use it for a variety of …Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: To “(1) He knows the answer already, but does not want to tell. If that i…Nov2chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: @tlfong01, I am beginning to respond consistently to your comments because tod…Nov2commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriverThe two lines you mentioned are at the top of the code that I posted, and I am using pwm.set_pwm(…Nov2commentregulating the speed of a motor connected to a TB-6612 FNG motor driver using the pwm output generated by the pca9685 multichannel servodriverhello! I used this tutorial and simply edited it. can you tell me which part you believe may be c…Nov1commentHow 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…Oct31commentUsing 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 …Oct31commentHow 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…Oct31chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: @tlfong01, First, about you… Today I read your answer about “JD-Vcc relay…Oct31chat replyDiscussion between tlfong01 and Circuit fantasistCircuit fantasist: @tlfong01, Again, I find that you are a very interesting person… not so typi…Oct30commentUsing 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…Oct30commentUsing a PNP over an NPN to activate a solenoid@tlfong01, You are an interesting person with this “philosophical” reasoning… I see s…Oct30commentUsing a PNP over an NPN to activate a solenoid@tlfong01, My answer was more general – about a multistage amplifier, where the output collector-…Oct29commentUsing 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…Oct29commentUsing 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…Oct29commentUsing a PNP over an NPN to activate a solenoidAh stupid me didn’t even register the solenoid wasn’t grounded by default, thanks! Also @…Oct26commentHow 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 movementMollyMal: @tlfong01 how would you transfer readings to smart phone? That sounds interestingOct24commentDo 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…Oct24commentProtecting circuit from piezoelectric disc voltage spike@tlfong01 In your cited answer you said “Conclusion: Zener diode is absolutely necessary!…Oct24commentHow exactly does a basic EMF sensor work?@tlfong01 no, the LED is not connected to the input. only an antenna is connected there.Oct23commentSMPS 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.Oct23commentSMPS powered DC motor inrush current problem@tlfong01 I’ve just found another solution that might work for you as well. I haven’t tes…Oct22commentHow does this two transistor circuit work?@tlfong01, please don’t forget that comments are for seeking clarification on questions or an…Oct22commentHow does this two transistor circuit work?@tlfong01 I dont understand what you are talking about. are you suggesting a circuit like this wo…Oct22commentLCD 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…Oct22commentLCD 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 …Oct21commentProtecting circuit from piezoelectric disc voltage spike@tlfong01 No, we are not solving inrush current here!Oct21commentProtecting circuit from piezoelectric disc voltage spike@tlfong01 question about the 1M resistor/zener circuit in practice. It was my understanding that …Oct21commentAm I a weak Electronic Engineer?@tlfong01, Thanks, your answer explains a lot.Oct21commentProtecting circuit from piezoelectric disc voltage spikeI’m affraid you misunderstood the reason for NTC in that inrush limiting circuit. There is ab…Oct21commentLCD Viewing angle for 8 COM vs 4 COM@tlfong01 you’re not helping. I am not sure if you have any questions..Oct21commentProtecting circuit from piezoelectric disc voltage spikeUh, \$m\Omega \ne M\Omega\$Oct21commentProtecting circuit from piezoelectric disc voltage spikeCould you please, please try to post straightforward answers that simply make your point without …Oct20commentLCD Viewing angle for 8 COM vs 4 COM@tlfong01 It is clearly about segmented LCD.Oct18commentWhy is resistor needed in ADC circuitHello @tlfong01, yes, it is a 3-bit ADC, it comes from the 8 different values that are distinguis…Oct17commentN-MOSFET Gate to Drain short and VgsFor 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…Oct17commentN-MOSFET Gate to Drain short and VgsWhy does the gate to source voltage become equal to gate to drain voltage, when shorted from gate…Oct16commentPowering Raspberry PI 4 from powerbank@tlfong01 the RPI4 requires 5V 3A is it ok?Oct15commentDS18B20 stopped recentlyThx again @tlfong01! Your suggestion (3) worked!! I used Aug Buster image & enabled only 1-wi…Oct15commentDS18B20 stopped recentlyThx @tlfong01! (1) Understand your suggestion rather well owing to the challenges in reading DHTx…Oct14commentHow 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…Oct13commentHow 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 …Oct11commentDC motor with motor driver included@tlfong01 please do not recommend the L298, it is an ancient, horribly lossy part. New projects …Oct10commentCan’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…Oct8commentHow 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…Oct8commentHow 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…Oct8commentHow can I use a 2N2222 transistor as a temperature sensor?I don’t consider any of those YT’s video’s as expert design referencesOct8commentHow can I use a 2N2222 transistor as a temperature sensor?but great effortOct8commentHow 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…Oct7commentSerial (RS232) Controled Projector@tlfong01 I have shorted it on the converter, but am unsure how to short it on the pi. How would …Oct6commentHow 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?Oct6commentHow 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…Oct6commentHow 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…Oct5commentHow 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…Oct5chat replyDiscussion between tlfong01 and Adrian MaireAdrian Maire: I created a community answer, so it is more a “joined” answer than “… Share this:TwitterFacebookLike this:Like Loading... Related Categories: Uncategorized
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