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    Another set of eyes to check my kicad schematic

    Hey all I am wanting another set of eyes to review my schematic to make sure I have everything connected correctly. It looks like its connected correctly to me but another set of eyes on it is always a good thing! I'm also wanting to find better substitutes for the C1 470uf and C2 1uf caps. Are...
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    My first schematic of a 2-channel relay board

    Hey all this would be my first try at creating a schematic in KiCad. The schematic is a basic 2-channel relay. The inputs are automotive 12v and gnd. This gets converted to 5v by the K78L05-1000R3. The Wemos D1 mini has 2 digital pin outs that are 3.3v going to the LTV-356T with a 200 kOhms...
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    First time schematic for USB-C power detection

    Hey all I am creating a PCB that allows me to detect when I plug in a tablet, laptop, etc. to my home made tablet organizer. It's difficult to see if it made a connection in the back since you place the tablet in the front and slide it back: I'm using the INA219AxD...
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    Connecting 6 push buttons with ESP32 with 1 common pin

    Hey all I have 6 buttons that have the following voltage: I want to hook up a 4N25 to each one of these so I can use the ESP32 as a "virtual push" to each of these buttons. When the button is pressed the 3.2vdc goes to ground. To minimize the amount of wire going to each one...
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    Creating a USB-C Passthrough with power charging detection

    Hey all I have a project I am needing to do but I'm unsure as to the best way to go about doing it. What I am wanting to do is check to see if a tablet or laptop is plugged into the USB-c cable so that I can have a visual representation of confirmation that it is connected correctly. Most of...
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    Reading 2 digit 7 segments with ESP32

    I have been trying to contact a forum member that has done a modification to his pool equipment in order to control it remotely instead of having to go to the box every time and check on the codes. His has released the source code on his github page. However, I have a different model than he...
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    Mini reflow oven advice

    Hey all I am venturing into making a DIY reflow oven. Been looking at many different types/styles over the last couple of years and feel now is a good time to start one. I originally planned on building this type of toaster oven. Looked nice with a touch screen and all. It also didn’t use the...
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    Having an ESP32 control a reed switch with wifi and deep sleep on LIPO battery

    I’m looking to create a project for my home. I am wanting to place window and door sensors (reed switch) and hook it up to my ESP32 wroom-32 (wemos) microprocessor. The version I have has the JST connector to hook up a LIPO battery to. I have 20 of these to use with a reed switch and a custom 3D...
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    Controlling Yihua 995D for USB control

    I recently purchased a YIHUA 995D SMD Rework Station and me being the geek that I am wanted to see if I could perhaps control it (via USB/ATMEGA) by using my PC and touch screen instead of physically doing so with my hands. Being able to control it via PC would allow me to mount the 995D under...
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    Arduino using ethernet for 3D printer Micro SD card

    So I have a 3D printer that relies on me to place the sliced images onto a micro SD card on my computer and then transfer it onto the micro SD card and place it back into my 3D printer in order for me top call it up to print. Me being a geek, I would like to know if there is any way I can use...
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    Marantz NR1605 clicks on then goes right back off

    Hi all. So I bought a Marantz NR1605 A/V off of eBay "as-is". The description reads: Marantz NR1605 AV Receiver As Is, no returns or guarantees Shipped with USPS Parcel Select Ground. This was a new receiver purchased in approximately early 2015. The receiver still turns on but I think during...
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    ESP8266 (esp-07) powered by battary(s) for at least 1 year

    Hey all I am trying to see how long I can possibly have a ESP8266 ESP-07 operate with only 1 or 2 of the Lithium Ion Battery 18650 Cell which claims to have 2600mAh. I am making a window alarm sensor and I'm looking to incorporate a window reed switch in order to check it's status via the...
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    Nest Protect gen 2 POE

    Hey all i am looking for some advice in how to go about my project with a Nest Protect gen 2. In my home i have ran cat6 wire to all 3 locations that require a smoke detector. These cat6 cables are connected to a POE switch for powering the Nest Protect. The version i picked up for the Nest...
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    Arduino reading double-din radio volume rotary dial knob

    Hey all I bought a Chinese double din radio in order to modify it to my liking. The main reason why i went with this one is that it had a few buttons and turn knobs on the front and i wanted to use an Arduino in order to "read" this inputs in order to do stuff within my software program...
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    Multiplex IC 5 inputs and 5 outputs custom?

    Hey all I am wanting to know if there is an IC that allows me to do the following: - Have 5 inputs - Have 5 outputs - Ability to take any input # and direct it to any output # The latter bullet there is the main goal. So in the image example above say that I needed the following...
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    wire gauge for iPad mini 2 soldering

    Hey all I have a simple question that I haven’t been able to find the answer to. What gauge wire would I need to purchase in order to solder a wire to some places on an iPad mini? The area looks like this: Originally I was thinking that 30ga would befine but I’m not sure.
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    4n25/35 optocoupler detect led on/off

    Hey all i am just wondering if my drawing below is correct in order to have an arduino detect an on or off led on another board using a optocoupler? My thoughts of the above drawing is that when the led is on it will trigger the relay inside and send 5v to the arduino digital pin to read. 0v...
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    24-30pin connector for digital picture frame

    Hey all I have 3 27" lcd panels that I will be making digital picture frames out of and I am looking for advice on what i can use in order to use only 1 cable going to the digital picture frame since it will be on the wall. The less wires the better. Currently I will be purchasing the lcd...
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    AMS1117-3.3 from 5VDC show 0.09vdc

    Hey all I am having an issue using this AMS1117-3.3 SMD: According to its documents it says its either a fixed or adjustable version? So I hook it up as I see in the documents: The left pin (1) being Ground. The middle pin (2) being the 3.3vdc output. The right pin (3) being the 5vdc...
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    Ways To Turn Knob With Stepper Motor Using Arduino

    Hey all I am wondering what would be the best items to purchase for me to be able to turn this know (continuous) below: I'm just needing to know what kind of servo torque I would need in order to turn that without issues of it getting stuck mid-ways. i spoke to the original creator of that...
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