submitted by /u/verytastysquid [visit reddit] [comments ..read more

New to PCB design. Please review this design for faults/issues. 5V and 3.3V powered via arduino along with the mosfet to be controlled via a digital pin and SDA SCL for sensor on arduino. The five resistors are placed to locally generate heat near the sensor. https://preview.redd.it/pexc3a3hwnyc1.png?width=965&format=png&auto=webp&s=72df5a97177eb5bb1ebceb79514d3f6d618cdda6 https://preview.redd.it/vies093hwnyc1.png?width=889&format=png&auto=webp&s=1f5c9107f1c97c9c27704bdeb16758ef7fa94ad7 https://preview.redd.it/xln9kp3hwnyc1.png?width=857&format=png&auto=web ..read more

submitted by /u/tactical_laser_tag [visit reddit] [comments ..read more

In my previous post, many of you guys gave me really good suggestions which really helped me a lot. Thanks! Big changes I have made in this version are these: I replaced the ACS712 with an INA226 replaced the BTS50080 with an NMOS added a NMOS to the battery to cut the connection when board is powered off added a pullup to DATA+ changed TPS7A92 to TPS7A90 please check if I need to do anything more before I get into real PCB design, thanks in advance! https://preview.redd.it/kjaxrabyncyc1.png?width=3507&format=png&auto=webp&s=856e1069b0a45e06b6319c687d3f69a9e783b16b submitte ..read more

submitted by /u/sansruido [visit reddit] [comments ..read more

Hey everyone, I designed a 2-layer board as a payload that will be installed in a supersonic rocket's nose cone made of aluminum. The purpose of the board is to measure the heat transfer of the aluminum as the rocket flies, measure airspeed via a pitot tube at the top of the nose cone, and turn on a fan as a cooling system since we will be launching the rocket in a very hot environment. Some notes: It should only be powered by a 3S battery as the fan input is not regulated (should it be?). Goes through a shunt resistor for current sensing I added an optional 5V LDO if my custom buck conv ..read more

Greetings, this is my second PCB design and I would like to know if there are any major errors that would make this board to not function properly. This time I moved from module to discrete IC. This board will be used to control WS2812B RGB LEDS and two micro Servos. It features a 3-axis accelerometer (I2C), a MEMS microphone with an amplifier. It is a 4-layer PCB: Top layer (SIG/3.3V), Inner1 (GND), Inner2 (GND), Bottom layer (SIG/3.3V) USB tracks are routed with 90 ohm impedance based on PCB manufacturer data and all the other signal with 50 ohm impedance. Power traces have 0.51mm (20mi ..read more

Greetings! I have designed a STM32F4-based microcontroller that implements a number of features, including USB-C, SD-card for datalogging (using 4-bit SDIO), 3v3 switching regulator, and RFM95 LoRa transceiver. Additionally, I have designed this board to be Arduino compatible (by mirroring Adafruit STM32F405 Feather), specifically for STM32duino libraries. Here is my layer structure: (1) SIG, (2) GND, (3) 3V3, (4) SIG I think the RF and SD-card circuitry could do some revisiting as I am new to it. Overall, any general feedback is greatly, greatly appreciated. This is my first project that ..read more

Is there a problem with the current Micro SD Card Circuit? My suspected issue: The SS (Chip Select), MOSI (Master Out Slave In), and SCK (Serial Clock) pins of the Micro SD card are currently connected through 470Ω resistors. Typically, these should have 4.7kΩ pull-up resistors to 3.3V to ensure reliable communication and proper logic level pulling? My propose solution: Change the resistors from 470Ω to 4.7kΩ pull-ups for the SS, MOSI, and SCK lines. The MISO (Master In Slave Out) line should be directly connected to the chip pin without a resistor. https://preview.redd.it/r95h7sixj8yc1 ..read more

submitted by /u/kuwoyuki [visit reddit] [comments ..read more