Search found 530 matches

by parkview
Fri Jan 14, 2022 5:44 pm
Forum: Product Reviews
Topic: Programming Clip
Replies: 0
Views: 21

Programming Clip

On most of my PCB's that I create, if it's going to be a end user programmed, I might place a USB UART, like a CP2102 on there, but as a backup, I will place a 3 pin [Rx-Tx-GND] 1.27mm pin-header onto the board, along with two 0402 0 ohm jumpers, so I can quickly isolate the CP2102 UART from the ESP...
by parkview
Fri Jan 14, 2022 5:20 pm
Forum: Projects
Topic: USB Power Controller
Replies: 4
Views: 3238

Re: USB Power Controller

Looks like I forgot to blog about V1.2 version of the board. I made it up in the first half of last year: USB-Power-Controller_Front_V1.2_sml.jpg Everything seems to work on the board and it's been fun to play with, but to show off it's capabilities, I need to bring along a plethora of strips of LED...
by parkview
Mon Jan 10, 2022 12:47 pm
Forum: Projects
Topic: Arduino Sensor Training Board
Replies: 6
Views: 1059

Re: Arduino Sensor Training Board

So, while the board looks ok to me, it occurred to me yesterday that I have put no thought into how to protect it from bits of metal falling onto the board and shorting things out etc. You and I know not to do that, but accidents can happen and beginners in Electronics might not appreciate the expen...
by parkview
Sun Jan 09, 2022 9:42 pm
Forum: Projects
Topic: Open source ECU's Highs, lows and blue smoke.
Replies: 5
Views: 372

Re: Open source ECU's Highs, lows and blue smoke.

Well done with designing it in FreeCAD. It's a clean design!
by parkview
Sun Jan 09, 2022 12:09 pm
Forum: Projects
Topic: Arduino Sensor Training Board
Replies: 6
Views: 1059

Re: Arduino Sensor Training Board

The version 0.7 blue PCB arrived earlier last year. It's been sitting around waiting for me to assemble it, which I did near the end of the year. After fixing the obvious solder shorts etc, it powered up ok, but for some reason i2C just wouldn't function. By that I mean there was zero clk and data w...
by parkview
Sat Jan 01, 2022 10:17 pm
Forum: Projects
Topic: XMAS Tree
Replies: 0
Views: 40

XMAS Tree

Back in October school holidays my granddaughter and I set out to create a Xmas Tree on a small 10cm high green PCB. The new Espressif ESP32-C3 had been announced earlier in the year, so I thought that with the price of electronic parts going through the roof, maybe I could try using this cheap new ...
by parkview
Fri Dec 24, 2021 5:44 pm
Forum: Projects
Topic: Remote Weather Station
Replies: 3
Views: 297

Re: Remote Weather Station

Today was a nice warm day, topping out at 34 deg C, so a great day to test out multiple solar PV panels. I used my Ideal Diode test board: https://forum.swmakers.org/viewtopic.php?f=12&t=2473https://forum.swmakers.org/viewtopic.php?f=12&t=2473 and configured for dual input, with one output. I made u...
by parkview
Wed Dec 22, 2021 3:25 pm
Forum: Projects
Topic: Remote Weather Station
Replies: 3
Views: 297

Re: Remote Weather Station

The PCB arrived the other day and the charger IC a week later from China. It didn't take long to make up the PCB, but I did need to print out a new battery holder, as my 18650 LiFePO4 (LFP), batteries don't have protection circuit built in, so they are 2mm shorter that my Li-ion batteries. Charger.1...
by parkview
Sat Dec 18, 2021 10:52 pm
Forum: General Electronics
Topic: Exploring Ideal Diodes
Replies: 2
Views: 388

Re: Exploring Ideal Diodes

That last post was all done with 12V. When I tested the circuits with 5V and RV6 set to 47K and RV5 set to 10K, I measured a 7mV across the RU30L30 MOSFET at a 190mA load current. The gate measured 0.88V to GND. When I fed 5V into the output, I measured -39mV at the input - nice! When I put 3.3V int...
by parkview
Sat Dec 18, 2021 10:32 pm
Forum: General Electronics
Topic: Exploring Ideal Diodes
Replies: 2
Views: 388

Re: Exploring Ideal Diodes

As I mentioned above, I have found three different Ideal Diode circuit diagrams on line (note the resistor values in #1 and #2), these are: 1) ideal-diode-schematic.jpg 2) ideal-diode-schematic2.jpg 3) ideal-diode-schematic.3.jpg These are all based on a transistor current mirror arrangement. I have...
by parkview
Thu Nov 25, 2021 9:22 pm
Forum: Projects
Topic: X27.168 Low Power Stepper Motor
Replies: 4
Views: 517

Re: X27.168 Low Power Stepper Motor

One thing I noticed playing around with ESP32 PWM channels is that they seem to effect each other. I noticed this when I set a 4KHz on channel 0 for the on board buzzer. I played a the tone, then set a 1KHz PWM frequency on channel 1. The motors move ok (now), but when I played the buzzer tone again...
by parkview
Tue Nov 23, 2021 10:25 pm
Forum: Projects
Topic: X27.168 Low Power Stepper Motor
Replies: 4
Views: 517

Re: X27.168 Low Power Stepper Motor

So my ESP32 Arduino program was using the ledcWrite() function to output 1.2KHz PWM at a 50% duty cycle. There was nothing listed in the datasheet about maximum pulse length, only the that it had to be at least 450nSec. At 1200Hz with a 50% duty cycle, my negative going pulse was something like 417u...
by parkview
Tue Nov 23, 2021 11:37 am
Forum: Projects
Topic: X27.168 Low Power Stepper Motor
Replies: 4
Views: 517

Re: X27.168 Low Power Stepper Motor

The controller PCB arrived the other day. I laser cut a paste solder stencil out and made up the PCB. It turned out rather well: controller_sml.jpg Above, I am testing out the software. My first version based on my understanding of the datasheet it didn't turn out well. It says the Max Frequency is ...
by parkview
Fri Nov 12, 2021 9:54 pm
Forum: Projects
Topic: WS2812 - Neopixel LED Strip PH 2A Connector
Replies: 1
Views: 244

Re: WS2812 - Neopixel LED Strip PH 2A Connector

The WS2812 to JST PH connector PCB arrived this week. I made a few up this afternoon. It didn't take long, as I only placed the PH connector and a 22uF SMT onto the PCB: WS2812-connector3.jpg Then a quick solder job to attach a strip of 12mm wide WS2812 RGB LEDs. To keep the LED strip in place, I he...
by parkview
Thu Oct 28, 2021 10:01 pm
Forum: Projects
Topic: X27.168 Low Power Stepper Motor
Replies: 4
Views: 517

Re: X27.168 Low Power Stepper Motor

So, with the motor mount PCB off being manufactured, it's time to ponder making a controller PCB to connect to the motor PCB's. My thinking at the moment is to have the AX1201728 IC being controlled by a cheap MCU that will be incorporated on the controller PCB. The MCU will act as an i2C slave devi...
by parkview
Thu Oct 28, 2021 9:30 pm
Forum: Projects
Topic: X27.168 Low Power Stepper Motor
Replies: 4
Views: 517

X27.168 Low Power Stepper Motor

Back in early October 2021, Stephen put me onto a rather nifty little Stepper Motor, behold the: X27.168. X27.1-front.jpg and the backside, with the two coil connectors: X27.1-back.jpg It's about 30mm across and about 9mm tall. The spindle can rotate reputably at 600 degrees/second at 5V and drawing...
by parkview
Mon Oct 25, 2021 11:54 am
Forum: Projects
Topic: WS2812 - Neopixel LED Strip PH 2A Connector
Replies: 1
Views: 244

WS2812 - Neopixel LED Strip PH 2A Connector

I love the JST PH connector. It's very versatile and compact. You can get it in surface mount SMD, or Through Hole package. It's rated for 100V, 2A. If you need more current, then there is the JST XH connector. It's rated for 250V, 3A. There are even higher rated connectors, but I haven't had a need...
by parkview
Sun Oct 24, 2021 11:48 am
Forum: General Electronics
Topic: Electronic Parts Storage
Replies: 2
Views: 607

Re: Electronic Parts Storage

Yay! It took 2 days for me to figure out how to write an edit function for my simple Parts Management Database! This is just kludged and hacked together Python code until it worked. A lot of wasted time wondering why it wasn't working as per on-line examples - until I realised that my Input fields n...
by parkview
Sat Oct 16, 2021 10:28 pm
Forum: Projects
Topic: Remote Weather Station
Replies: 3
Views: 297

Re: Remote Weather Station

While I started designing up a 10cm x 10cm cheap Beta version with some weather station sensors and a STM32L151RE MCU, I quickly hit the silicon shortage snag and found that if you can find MCUs, prices have gone through the roof. A MCU I purchased back in 2019, is now five times the price. I now ha...
by parkview
Sat Oct 16, 2021 10:01 pm
Forum: Projects
Topic: Remote Weather Station
Replies: 3
Views: 297

Remote Weather Station

What does the words: Remote Weather Station conjure up in your mind? In mine, it's a weather station way out off the main road on the Nullarbor desert. This will be a many phased project - each phase building on the previous one as I learn and experiment along the way. Something like this: Beta: jus...