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Use for questions specific to the Raspberry Pi 3 Model B+

0
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Question Rpi3B+ from AliExpress OK? Answer Yes, should be OK, except perhaps a little bit more expensive. A couple of years ago, an old version of Rpi was manufactured in ShenZhen, China. And the …
answered May 15 by tlfong01
0
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Question Still seeing the lightning flash when running script on the SenseHat, ... Answer Me too. The yellow lightning comes and goes. My power supply is not that good. I am thinking …
answered Jun 28 by tlfong01
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Question Device = 20 x 4 LCD Java-code can't get the screen to clear or show anything at all Answer Well, I see that your program are using lcd.clear(), and lcd.write(). But I don't see any lcd. …
answered May 15 by tlfong01
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Question I wrote a script using GPIO pins and I'm fairly certain there was no way for it to cause a short circuit. Answer Well, if you are connecting a GPIO pin to any pin of a 5V powered …
answered Jun 2 by tlfong01
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Question When using Rpi3B+ python to control servo using PWM, If d = f(t) where d = angular distance traversed, t = time Is f a smooth step function? Any suggestion to modify the …
answered Apr 23 by tlfong01
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Yes, as advised by Jan Hans, the use of the ADDR pin is clever.
answered Mar 25 by tlfong01
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Question How to connect Rpi to 50 microphones? How to store a few seconds of analog audio signal on the SD card? Need a multiplexer? if so, how many? Short Answer A quick and di …
answered May 24 by tlfong01
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Question Can Rpi control 5 lidars at the same time? Answer (1) You might not need 5 Lidars. You can just use one front, one rear, with servos rotating and sensing at the same time. Five Lidar …
answered Sep 9 by tlfong01
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Question How come Rpi3B+ Raspbi9 has 50+ TTYs, but I can only use 6? How can greedy me grab more TTYs? Answer Well, "tty", or "TeleTYpe", like TeleVision, in the stone age, the tele-typewrit …
answered May 13 by tlfong01
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Question Two identical Rpi3B+ setups, "good" setup boots SD Card OK. The "bad" setup can only start booting to 4 green LED blinks, then stops. Why? Answer I suspected your PSU is margin …
answered May 20 by tlfong01
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I guess it is rpi's hidden built in gpio pull resistor that confuses you. To avoid the tri state input pin floating, you can pull the pull resistor to either Vdd or ground. Suppose you pull the …
answered Apr 21 '18 by tlfong01
1
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You problem can be explained voltage divider rule. I did the following quick and dirty test to show how the pull up resistor confuses you. My test is on the I2C SCL pin. I first googled to find …
answered Apr 26 '18 by tlfong01
1
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I think the scanner is TTL RS232 compatible and easily interface with Rpi UART. The picture in the ad seems misleading. I think the CCD camera does not go into Rpi's CSI connector, but integrated …
answered Apr 8 by tlfong01
2
votes
Pi HAT Waveform Generator for Raspberry Pi 3B+ 300 kHz sine waves at about 8 samples per waveform Sampling rate required is around 2.5 MSps. Have you considered the function generator m …
answered Apr 12 by tlfong01
2
votes
I have been using raspi-config always found it working. Sometimes my modules are not working. So I usually use two little test programs to check. One program is to repeatedly send out bytes and use …
answered Apr 24 by tlfong01

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