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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

    Final schematic: 1) Removed LTV-356T Opto. 2) Added 10k between Base and Emitter of the PMBT3904. 3) Connected LED to 5v line instead of the collector line on the PMBT3904. 4) Replaced 200R with 220R. 5) Replaced normal fuses for blade fuse holders. 6) Replaced 18v G5LE-1 relay with the correct...
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    My first schematic of a 2-channel relay board

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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

    So something like this?
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    Creating a USB-C Passthrough with power charging detection

    Yes no data would be needed. Only power. I was thinking today that I could use a limit switch in each decider for the tablet/laptop to hit causing the signal that it’s charging but that doesn’t really tell me it’s connected correctly and is actually charging.
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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

    So I'm looking at my version of the ESP32 that I have (Known as the Lolin32) And looking at their schematic I see that they call out GPIO 16, 17, 18 & 19. However, I do not have the same pin layout as they do...Go figure... - GPIO 19 -> SWG main board clock - GPIO 18 -> SWG main board data -...
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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

    Is there any truth to the claims of the T-962 having asbestos inside their machines?
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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've noticed that the IC above has a TX/RX UART line(s) looking at the diagram on page 9 of the datasheet. 9.7 Port 4 Port 4 is an 8-bit I/O port with individually configurable pins. Port 4 pins are accessed directly by writing or reading the port 4 data register, P4 at location F5H...
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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

    Ah just found this youtube video(s). Seems just what I am looking to do. Thoughts? Original video: Feedback (updates) from the above original video: So if his setup lasts a long time on CR2032 with 240uA batteries then I'm guessing a 1000uA+ would last even longer than that?
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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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