Blog - All Comments

RE: HEART RATE MONITORING WRIST BAND

Alessia — Fri, 28 Jul 2023 12:47:20 GMT

Does the Red light work on sensing the beat on the wrist?

RE: Final Countdown - ADC from scratch demo video

dubbie — Tue, 06 Apr 2021 08:56:01 GMT

A neat implementation and a good demonstrator. I once made a SAR DAC myself out of TTL chips way back in the early 1980s as my first post graduate electronics project. It worked but it wasn't particularly linear. I learnt alot about ADCs doing this which helped me later in my future lecturing career.

Dubbie

RE: Final Countdown - ADC from scratch demo video

Workshopshed — Mon, 05 Apr 2021 18:52:27 GMT

A great explanation and demonstration of the ADC and DAC

RE: Micro Servo Tester #3 : Now With Pulse Generator! (Video now working)

beacon_dave — Sat, 20 Mar 2021 11:08:31 GMT

You may be able to use some of the AVR timer architecture to offload some of the timing work allowing you to use the display.

You can set up a timer compare match interrupt to directly toggle an output pin, so your 10 turn pot would load the value in the output compare register and the rest is taken care of in the background, potentially leaving you time to update the display.

Arduino uses some of the AVR timers for its own functions so you would need to be mindful of that.

More information here which may be of interest:

http://ww1.microchip.com/downloads/en/AppNotes/Atmel-2505-Setup-and-Use-of-AVR-Timers_ApplicationNote_AVR130.pdf

Compare Match

In cases where it is not sufficient to monitor a timer overflow, the compare match interrupt can be used.

The Output Compare Register (OCRx) can be loaded with a value [0 .. MaxVal] which the TCNTn will be compared against in every timer cycle. When the timer reaches the compare value, the corresponding Output Compare Flag (OCFx) in the TIFRn register is set. The Timer can be configured to clear the count register to zero on a compare match.

Related output pins can be configured to be set, cleared, or toggled automatically on a compare match.

This feature is very useful to generate square wave signals of different frequencies. It offers a wide range of possibilities, which makes it possible to implement a DAC. The PWM mode is a special mode which is even better suited for wave generation. See the device datasheet for details.

RE: Drone Motor Thrust Tester

genebren — Fri, 19 Mar 2021 20:24:32 GMT

Great project, with top notch documentation/write-up! I really enjoy the 3D prints (again) and the control panel display was very nice. Keep up the good work!

RE: Drone Motor Thrust Tester

carmelito — Fri, 19 Mar 2021 16:23:55 GMT

Very useful project, thanks for sharing.. Let me guess, is it a EMAX 2204, 2300 KV motor ? it has been been the most trust worthy motor for my flying wing [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-f86ecd9e-ee5c-46b9-8d7e-c5071d7c1fc0/1732.contentimage_5F00_1.png:16:16] ..

Carmelito

RE: Color Detector

dubbie — Fri, 19 Mar 2021 15:51:54 GMT

A very nice, well constructed and user friendly blog. It must have taken you a long time to construct it. Also a nice project on colour detection.

Dubbie

RE: Drone Motor Thrust Tester

jw0752 — Fri, 19 Mar 2021 04:34:34 GMT

Wow! Awesome project. I really enjoyed reading about it.

John

RE: Drone Motor Thrust Tester

three-phase — Thu, 18 Mar 2021 21:56:42 GMT

Excellent project and write up. Thanks for sharing.

Kind regards.

RE: Color Detector

navadeepganeshu — Thu, 18 Mar 2021 10:05:10 GMT

Cool project [mention:851ab0f9941c487cabc3fe5a4f56d75e:e9ed411860ed4f2ba0265705b8793d05]!

Nice way of using LDR to get analog voltages in different ranges instead of an expensive colour sensor.

RE: Color Detector

yesha98 — Thu, 18 Mar 2021 04:01:42 GMT

Thank you so much [mention:d85999949f974a74a457e05151ea1c2b:e9ed411860ed4f2ba0265705b8793d05] !!

RE: Color Detector

14rhb — Wed, 17 Mar 2021 20:39:54 GMT

A well explained project from ADC basic concepts to your final colour detection design, well done.

RE: Drone Motor Thrust Tester

14rhb — Wed, 17 Mar 2021 20:36:52 GMT

In such a short blog you've captured and written up another very professional project, well done.

I don't have a drone but I do particularly like your Qt GUI design approach, so thank you for including the code so I can see how that is achieved [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-f86ecd9e-ee5c-46b9-8d7e-c5071d7c1fc0/contentimage_5F00_1.png:16:16]

RE: HEART RATE MONITORING WRIST BAND

neilk — Wed, 17 Mar 2021 16:40:22 GMT

Very nice project.

Neil

RE: Drone Motor Thrust Tester

phoenixcomm — Tue, 16 Mar 2021 18:23:45 GMT

[mention:1fea68f71fde47f2beff1fc2c7890056:e9ed411860ed4f2ba0265705b8793d05] I love it. you are sic.! This is just what I need to test the thrust of my experimental aircraft ducted turbine!! woopie! thank you so much. I will have to scale this up quite a bit as my engine weighs in at about 100lbs.

I want to experiment with the number of blades on the fan. 4, 8, 16, 32 etc. plus I have designed a small 2-3 stage compressor but I need to check the gear ratios.

~~ Cris

PS I will also need to check the pressure , and airflow in each of the sections of the motor