Questions tagged [pins]

May refer to conductive traces of an integrated circuit, exposed as metal contacts, or pins, which are large by comparison and make physical connection to other components feasible. May also refer to metal pins connected to specific traces of a printed circuit board for the purpose of connecting and disconnecting external components or peripherals in a reusable way.

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26 views

How do I connect the SlideSwitch SS12F15G6 to the microcontroller arm stm32f103v8t6?

I want to connect the microcontroller arm stm32f103v8t6 to the SlideSwitch SS12F15G6. The stm32f103v8t6 has a lot of pins. Unfortunately I did not find enough information about the SlideSwitch ...
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38 views

Unable to toggle an LED with STM32 Blue Pill

I'm a beginner, and I'm using an STM32 Blue Pill board for the first time. I completed a basic tutorial on how to activate the PC13 pin (on-board LED), but now that I'm trying to get an external LED ...
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1answer
42 views

Where can I find how to use those rf transmitter/receiver

I bought those rf trans/receiver (GWB T400) I figured out that the sck, miso and mosi are for the spi communication. Gnd and 3v3 are pretty clear as well but I’m not sure what rst and cs are for. I ...
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32 views

How to identify an unknown LCD pins from scrap, and use it for Arduino

I've got an unknown LCD from scrap, I don't know what each pin is. can anyone help me with this? it has 19 pins that 16 are functional. also when I touch each pin with hot solder some signs turn on.
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45 views

SPST pin configuration

I ordered a SPST switch (Through hole type) from distributors and also download the cad file for PCB layout from the same website. I am now confused with the pin configuration, in the footprints it ...
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67 views

Can USB head cause a spark?

I made a USB port in a gas detector prototype. I plan to keep a USB cable attached to that USB port forever. I silicone conformal coated the USB port pins on the PCB. Can the USB head of the cable ...
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2answers
66 views

Identifying this type of pin header soldered to the board

Does anyone know what these are called?
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29 views

Can an I2S speaker and microphone share the same I2S clock? What about word select?

If one is very tight on GPIOs, could an I2S TX and RX share any pins? Edit: The device I was thinking of was the ESP32, connected to an I2S microphone and speaker, for example SPH0645 and MAX98357A.
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1answer
70 views

What is the name of this item contact pin?

I am making a box with lights inside of it. These lights are UVC lights, which will sanitize any items put inside. I have attached a photo; I would like to know the name of this item. I know it is ...
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26 views

Esp8266 Led turn on pin d4

I have a led hooked up to pin d4, and strangely for some reason flashes back and fourth when the native led on the esp8226 board is flashing, which is while it is flashing the program. I have the ...
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22 views

How would I trigger the flash button from a different button, or just trigger a different input via a button

I have a esp8266 nodeMCU Board I have the following schematic (or breadboard setup) I looked up my board and it says d3 is the flash button so I thought I could just hook up to it and my code would ...
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45 views

Is it generally OK to ignore the current in and out of a MCU pin when analyzing circuit external to the MCU?

From here, I see below illustration about the pull-up resistor. And the article says: With a pull-up resistor, the input pin will read a high state when the button is not pressed. In other words, a ...
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29 views

Pins for SIP Adapter

Looking to make some SIP to DIP adapters and I'm trying to find some individual flat pins as per the below image - does anyone know where to get them or what they are called? An alternative is to use ...
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I can't see my new PSU symbol in Eagle

I am new to Eagle having just returned to my hobby after many years and decided to use Eagle. I need a 1v8 supply net, and so followed the guidance and created my own supply line in my own library. ...
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40 views

LCD Viewing angle for 8 COM vs 4 COM

I'm planning to make a custom LCD made. The LCD has 128 segments. Now, in order to drive it, I have two options : Use 4 COM + 32 pins Use 8 COM + 16 pins The MCU which I'm looking at (STM8L052R8) ...
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1answer
72 views

What does this circuit on my battery do?

I have a Parrot Mambo which has a very low flight time, so I would like to tether it up with some power supply. However, the battery uses 3 instead of 2 pins and i'm not sure what each of them to. I ...
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2answers
122 views

What's the relation between the serial connector RS232-DB9 and 10 pin cable? [closed]

I bought one refurbished TP-LINK switch model TL-SL3452: and I needed to restore it to factory settings. To do that I tried to connect the serial cable but I accidentally broke one of the pins on the ...
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44 views

Male/female jumper wires for really small and close-to-each-other pins

I have a 20 pin 'male to male' 1mm pitch connector as shown in the included picture (I'm not sure if it's the correct name). One side will be soldered to the board, and the pins on the other side need ...
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2answers
69 views

Equivalent solution to soldering STM32F103C8T6 Board [closed]

There is this project I am doing and part of it I will be using a STM32F103C8T6 Board. Unfortunately, I do not have a soldering kit as i for now I cannot solder the pins of the board. Is there an ...
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157 views

Change ESP8266 I2S pins

On ESP8266 the default pins for I2S are: Data bits (SD) = GPIO3/RX0, Data bit-clock (SCK) = GPIO15, Word select (WS) = GPIO2/TX1 However in my application Im using these pins for another purpose. Is ...
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1answer
99 views

What are these pins?

I was looking at this component, which has strange interface pins. I have never seen anything like it. I wonder how am I supposed to connect to them. What connectors can I use and what's special ...
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1answer
74 views

Need help identifying components! Hardware

So recently I have come across a schematic diagram with pictures, but some of the parts in the build (A quadruped robot, more information in the hackaday link below) are not in the schematic, and I ...
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2answers
547 views

Are pins supposed to have the same thickness by some standard?

I bought a DHT-22 temperature sensor, some other sensors, and some jumper cables. The cable and the pins on other sensors and a Raspberry Pi fitted well, but the pins on DHT-22 seem thinner. The ...
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1answer
55 views

How to tap a pin on very small surface mounted IC

I have very small surface mounted IC (see link https://www.st.com/resource/en/datasheet/stm32l486qg.pdf). I need to access some pins on the IC in order to perform ETM trace. My challenge so far has ...
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1answer
98 views

Why do some IC pins have an asterisk behind them?

I am learning Arduino and one question asked what Arduino NANO's assignment of ATMEL's PD1* pin is. What does the asterisk mean in this context? Edited to add NANO
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66 views

What is the meaning of a circle next to a component pin?

I'm analyzing the schematics of Lenovo_G530_N500_-_COMPAL_LA-4212P_JIWA3_JIWA4_-_REV_1.0Sec. I have across scenarios where there is a circle next to a component pin....
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2answers
50 views

What is the meaning of these datasheet dimensions?

I am trying to buy a part for a project and I can't seem to understand what, ("B = A + 0.83[4.00]") means. Is this datasheet in mm or inches? Your help would be greatly appreciated.
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1answer
275 views

Finding each UART pin with multimeter

I am trying to findout the pinout for Serial Connection to a router. However I wasn't able differentiate the pins other than GND. Pinout: ...
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1answer
35 views

Can I use WP(Write Protect) pin of a USB flash memory controller to prevent tampering with its firmware/stored data?

I want to have an USB stick that I can make it read-only and insert it in any untrusted PC without risking a silent BadUSB infection. I was thinking about finding an USB stick that has this WP pin in ...
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17 views

RC522 has other pins than shown in all the tutorials

I've bought an RFID RC522 module which I intend to use with my Raspberry Pi 3B+. I read the following tutorials and I noticed that their modules have other pins than the one I bought: https://www....
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1answer
170 views

What is the difference between 16-pin and 24-pin for USB type-C?

I'm pretty new to PCB design. I am trying to make a circuit that will take 5V/3A input, charge 3.7V Li-Po battery, give 5V/2A output, and also has a charging protection IC. For 5V/3A, it seems to ...
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2answers
2k views

What are press-fit pins used for?

I found a this DIP socket that has "press-fit" pins. What are these actually used for? Are they literally used as a replacement for soldering? If so, why would anyone do this since that would seem to ...
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1answer
36 views

Connecting a signal to a pin in Quartus

I want to connect a signal in a .v file to a top level pin assigned in the pin planner but I've no idea where to start. I've looked at several guides but as a C programmer this is all quite alien to ...
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1answer
167 views

STM32F4 I/O Max Voltage Input

I'm having trouble understanding the max voltage input voltage range for an I/O pin on a stm32F11 when powering it with 3.3V.I'm want my STM32 to communicate with a 3.3V input signal and need to know ...
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2answers
72 views

Based on this data sheet for the 74HCT173, which section(s) describes the maximum current I can draw per output pin?

I want to size the LED's with resistor in series properly. Thanks https://assets.nexperia.com/documents/data-sheet/74HC_HCT173.pdf
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36 views

Replacing soldered pins with FFC socket

I have this PCB where 13 cable pins used to be soldered to. I'd like to replace that with a standard FFC connector socket. Is this possible given the pattern shown in the image?
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1answer
15 views

CircuitMaker: Nets Wire JACK_IN_GND has multiple names, why is this bad?

There is a solution here: How can I resolve the error "Net wire X has multiple names"? However, JACK_IN_GND and JACK_OUT_GND will go to two different directions (one input cable and one ...
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1answer
39 views

CircuitMaker warning: How to define ports?

I created a (for me) fairly big (multisheet) circuit diagram in CircuitMaker. However, I get several warnings/errors after clicking Outputs/Electrical Rules Check. One of them is below; how can I fix ...
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2answers
173 views

What are the STB and DIO pins on an IC

What are DIO and STB pins in below IC? If DIO means digital input or output, then how to set it to Input or Output mode? Is it using STB?
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1answer
61 views

How do I solder thick goldplated DIA pins?

I am struggling with soldering some pretty think gold plated DIA pins to one of my boards. I've tried various things such as; Increasing the heat of my soldering iron, but am afraid of burning my ...
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3answers
101 views

SSP1117-5.0V Fin connected?

I'm looking into the SSP1117-5.0V voltage regulator, but can't find if Fin is connected to any other pin.
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2answers
85 views

How deep are standard female pin headers?

I have a couple pcbs that will mate together with pin headers. I will have a 15mm standoff to separate these 2 boards. In my research it looks like the female pin header sockets seem to be about the ...
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2answers
226 views

How to clean DUST stucked due to moisture on pins of chips ICs of motherboard circuits

Which chemical can I clean my old motherboard with, whose electronics components chips pins like ICs capacitor transistors diodes have dust stocked their color has been changed to black yellowish ...
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6answers
130 views

Is a floating pin equivalent to a very weak pull down?

I know that if a MCU pin is configured as "input" and it is not connected to any pull up/ pull down resistor, it is said to be floating. In this situation, we could say that the pin is in series with ...
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7answers
762 views

Why can a MCU input floating pin easily change state?

I would like a technical ("engineering") explanation of why a MCU input floating pin can easily change its state depending on the outside electromagnetic interference. Is it related to the fact that ...
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2answers
75 views

Sequence Detector forced to wait a specific number of bits

So I have this little problem, where I am supposed to build a sequence detector which is forced to wait a specific number of bits before going into the reset state. It's kind of like pin codes work. ...
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45 views

Using pull-down resistor, but driving pin high by connecting to Vcc directly

I have a device that I know very little about. I have access to Vcc and Gnd pin there, and it operates on +5V. I need to drive its input pin high or low depending on a switch, that's UART RX input. I ...
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1answer
105 views

mcu input pin 24V protection

I've been looking at input protection circuits and I came across to some circuits that look like this one. Which is just based on the series resistor R1 to limit the current that flows through the MCU ...
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1answer
1k views

How do I configure the wires in the LVDS 30 pin cable?

I explain: I have a screen that I want to use as a monitor. I have purchased an LCD controller board and a LVDS cable I need someone to help me to rewire the LVDS cable. I have the input terminal pin ...
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81 views

Pin assignments do not appear to be assigning in bdf - Quartus 17.1

Following the pin assignment diagram in the device manual for my Max 10 DE10-Lite, I assigned all the correct pins to their associated inputs and outputs as seen below: However, when I go back to my ...

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