Search found 601 matches
- Sat Dec 18, 2021 10:32 pm
- Forum: General Electronics
- Topic: Exploring Ideal Diodes
- Replies: 2
- Views: 7405
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...
- Thu Nov 25, 2021 9:22 pm
- Forum: Projects
- Topic: X27.168 Low Power Stepper Motor
- Replies: 5
- Views: 10977
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...
- Tue Nov 23, 2021 10:25 pm
- Forum: Projects
- Topic: X27.168 Low Power Stepper Motor
- Replies: 5
- Views: 10977
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...
- Tue Nov 23, 2021 11:37 am
- Forum: Projects
- Topic: X27.168 Low Power Stepper Motor
- Replies: 5
- Views: 10977
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 ...
- Fri Nov 12, 2021 9:54 pm
- Forum: Projects
- Topic: WS2812 - Neopixel LED Strip PH 2A Connector
- Replies: 2
- Views: 5197
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...
- Thu Oct 28, 2021 10:01 pm
- Forum: Projects
- Topic: X27.168 Low Power Stepper Motor
- Replies: 5
- Views: 10977
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...
- Thu Oct 28, 2021 9:30 pm
- Forum: Projects
- Topic: X27.168 Low Power Stepper Motor
- Replies: 5
- Views: 10977
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...
- Mon Oct 25, 2021 11:54 am
- Forum: Projects
- Topic: WS2812 - Neopixel LED Strip PH 2A Connector
- Replies: 2
- Views: 5197
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...
- Sun Oct 24, 2021 11:48 am
- Forum: General Electronics
- Topic: Electronic Parts Storage
- Replies: 2
- Views: 6682
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...
- Sat Oct 16, 2021 10:28 pm
- Forum: Projects
- Topic: Remote Weather Station
- Replies: 3
- Views: 3874
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...
- Sat Oct 16, 2021 10:01 pm
- Forum: Projects
- Topic: Remote Weather Station
- Replies: 3
- Views: 3874
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...
- Thu Oct 07, 2021 1:54 pm
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Re: Visiting Four out of Five Adelaide Makerspaces
While not Makerspaces, I did visit the Goolwa and Victor Harbor Libraries. These both hosted 3D printers from which the public could come in and print out things they had designed or downloaded from the Internet. This is the Goolwa Library printer: Goolwa.jpg The Victor Harbor Libraries has a volunt...
- Thu Oct 07, 2021 1:48 pm
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Re: Visiting Four out of Five Adelaide Makerspaces
5: Adelaide Hills Business Centre and Makerspace Web: https://www.adelaidehillsbc.com.au/facilities/ This is one place I didn't get time to visit as it was a ways out of town. I did call the coordinator and he offered to give me a tour of the space, as it was closed to the general public due to Cov...
- Thu Oct 07, 2021 1:40 pm
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Re: Visiting Four out of Five Adelaide Makerspaces
4: Port Adelaide Enfield Library Makerspace WEB: https://www.cityofpae.sa.gov.au/explore/libraries/makerspace and https://stemlibrary.space/iot-experimenters/ I was tipped off about this Library based space while chatting with a member of the Adelaide Makerspace. I was grateful that Robert, one of t...
- Thu Oct 07, 2021 12:29 pm
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Re: Visiting Four out of Five Adelaide Makerspaces
3: Adelaide Hackerspace: Web: https://hackerspace-adelaide.org.au/ This is space specialises in Electronics and computers and is open two nights of the week. On Tuesday night 18:00-21:00 it's hosted at the Torrens Flinders University Campus - Digital Lab, and on Thursday night it's hosted at the Ad...
- Thu Oct 07, 2021 12:03 pm
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Re: Visiting Four out of Five Adelaide Makerspaces
2: SANE Makerspace Web: http://www.sanemakerspace.com/ This is a commercial Makespace, in that a few people have got together to host the space and people can pay to use the space. It is very strong on wood working and hosts three very busy laser cutters, bandsaws, planers, a lathe, drills and a fu...
- Thu Oct 07, 2021 11:57 am
- Forum: Off Topic
- Topic: Visiting Four out of Five Adelaide Makerspaces
- Replies: 5
- Views: 17356
Visiting Four out of Five Adelaide Makerspaces
In August/September 2021 I spent six weeks in and around Adelaide. Before I left, I looked up all the Maker/Hacker spaces I could find with the idea I would set out to visit as many as I had spare time to stop by. 1: Adelaide Makerspace Web: https://makerspaceadelaide.org/ This is the largest of the...
- Wed Sep 08, 2021 1:15 pm
- Forum: Projects
- Topic: Universal e-Paper Name Badge
- Replies: 8
- Views: 17332
Re: Universal e-Paper Name Badge
Today I upload the next PCB revision design to JLCPCB to manufacture. This will fix a couple of wiring issues and will include a MPU-6050 accelerometer, so the board will be able to rotate the text depending on which way your mounting the unit. I am also trialling a ESP32-C3 MCU. This is being bille...
- Wed Sep 08, 2021 1:03 pm
- Forum: General Electronics
- Topic: Exploring Ideal Diodes
- Replies: 2
- Views: 7405
Exploring Ideal Diodes
I have used some Ideal Diode circuits in a few projects now, but have found that they leak a reverse voltage back through the Diode (MOSFET). Scouring the Internet, I have found three different designs all based around the idea of turning off a MOSFET if there is no voltage on one side of the MOSFET...
- Fri Sep 03, 2021 8:35 am
- Forum: Projects
- Topic: Throttle Boddy Driver
- Replies: 2
- Views: 3339
Re: Throttle Boddy Driver
Love the GIF! How are you driving the flap position? If it's a variable resistor, or an encoder, have you looked at the values to see if there is an instability/fluctuation in the incoming data? Maybe displaying the data in the Arduino Serial plotter might help to make sure it's linear?