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Simon Merrett

Genesis, analysis, synthesis,

Devon
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173 Followers
22 Following
12 Projects
296 Likes
simon-merrett
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This user joined on 07/15/2016.

16k
410
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Strain wave or harmonic drive gears are cool. As a cheap analog for metal or flex filament splined cup, try using timing belts.
Project Owner Contributor

Strain Wave Gear with Timing Belts

Simon MerrettSimon Merrett

6.5k
77
28
84
This PCB footprint allows you to use 3mm x 6mm edge of PCB and a SOIC-8 clip as a cheap and space-efficient connector
Project Owner Contributor

SOICbite Programming/Debug Connector Footprint

Simon MerrettSimon Merrett

11.6k
27
12
17
Much cleverer people hacked the orginal UT390B laser range finder but no-one seems to have published what we know about the UT390+.
Project Owner Contributor

Peek inside UNI-T UT390B+

Simon MerrettSimon Merrett

5.7k
16
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15
A proof of concept ultra-low cost jog (and other gcode commands) control pendant for grbl CNCs. Concurrent with PC serial! DIY macros!
Project Owner Contributor

grbl "Man in the middle" CNC jog pendant

Simon MerrettSimon Merrett

1k
16
1
12
Use servos, alu profile, timing belt and 608 bearings to make one.
Project Owner Contributor

Cheap Linear Actuator

Simon MerrettSimon Merrett

899
9
9
11
Indoor (lawn) bowls wheelchairs can be motorised to make the sport more accessible. We motorised one with steppers for 10% of a kit cost.
Project Owner Contributor

Stepper-motorised wheelchair

Simon MerrettSimon Merrett

View all 12 projects

84.6k
3.2k
39
262
Building an open source robot arm for makers and small businesses
Project Owner Contributor

5+ Axis Robot Arm

Dan RoyerDan Royer

38k
734
31
256
Modular self-reconfigurable robot, focused on all-terrain search and rescue operations using bio-inspired locomotion mechanisms
Project Owner Contributor

Dtto - Explorer Modular Robot

AlbertoAlberto

9.9k
52
18
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or "flip dotters" if you want. Let's just talk about flip-dot/flip-disc displays and projects using them :-)
Project Owner Contributor

Dot flippers

Yann Guidon / YGDESYann Guidon / YGDES

2.1k
36
10
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Very low cost Pick and Place machine
Project Owner Contributor

SimplePnP

ottoragamottoragam

3.1k
37
13
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X carve Inspired Laser CNC machine which can help Develop quality PCB at home without using expensive photography films and dusty milling.
Project Owner Contributor

CNC Laser PCB Maker

manjuprasadmbasangimanjuprasadmbasangi

457
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Let's talk about radio.
Project Owner Contributor

RF Chat

Ted YapoTed Yapo

12.1k
239
17
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8 GHz BW, up to 1 TS/s ET Sampling
Project Owner Contributor

8 GHz Sampling Oscilloscope

Ted YapoTed Yapo

9.3k
176
17
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Clock projected onto the wall with cheap laser galvos
Project Owner Contributor

Laser Galvo Clock

Alan GreenAlan Green

7k
598
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A compact modular design of the strain wave gear for general robotic applications.
Project Owner Contributor

Compact Strain Wave Gear Actuator(s)

Leo VuLeo Vu

6k
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Ardunio-Compatible M0/Zero/SAMD21 running Actuator FOC OS with FET Driver, MOSFETs, Absolute Magnetic Encoder, USB and RS485 comms. ~$US50
Project Owner Contributor

Brushless Actuator (Arduino-Compatible)

Paul GouldPaul Gould

4.3k
557
5
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A general purpose robot joint using a cycloidal gearbox and an ODrive modified to support active compliance
Project Owner Contributor

3D Printed Robot Joint with Active Compliance

Tim WilkinsonTim Wilkinson

4.3k
473
5
12
Creating a break-out board for the ATtiny1616 where sketches can be uploaded from Arduino with the Arduino UNO or a modified AVR JTAG ICE
Project Owner Contributor

ATtiny 1-series with Arduino support

Sander van de BorSander van de Bor

3.2k
27
3
22
A lower cost, more capable Nano
Project Owner Contributor

A new Nano

Kevin TimmermanKevin Timmerman

2.2k
37
4
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First prototype of an open kit to bring electric drive to any existing wheelchair for cheap (and -hopefully- safe)
Project Owner Contributor

Open electric drive kit for wheelchairs - alpha v

adria.junyent-ferreadria.junyent-ferre

2.1k
36
10
24
Very low cost Pick and Place machine
Project Owner Contributor

SimplePnP

ottoragamottoragam

1.4k
205
2
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Internet radio and BT speaker in a small form factor with minimalistic user interface
Project Owner Contributor

ESP32-based internet radio and bluetooth speaker

VedranVedran

997
11
3
11
Less of a project than a collection of blog posts
Project Owner Contributor

Learning openEMS

Ted YapoTed Yapo

952
15
6
12
Just want to share the experience of building pick and place machine.
Project Owner Contributor

Details of pick and place machine build.

TeemoTeemo

413
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Develop easy to use Attiny 1 series dev boards with full Arduino Support
Project Owner Contributor

$3 Tiny Arduino Alternative Board

xukangminxukangmin

273
1
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Clap-clap, light goes on. Clap-clap, light goes off. This makes me happy.
Project Owner Contributor

Happy Clap Switch

Alan GreenAlan Green

179
4
0
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All I/O pins on headers, breadboard compatible, with 3V3 voltage regulator on board. KiCAD/Gerber files in the files section!
Project Owner Contributor

ATTINY x61(A) breakout board (SOIC)

JanJan

134
1
6
1
hi res absolute hollow shaft optical encoder
Project Owner Contributor

Encoder project

Dan RoyerDan Royer

133
2
0
2
Cascaded sensorless BLDC control with a MSP430F5529 Launchpad in combination with a DRV8323 Boosterpack
Project Owner Contributor

MSP430 sensorless BLDC

Benjamin PrescherBenjamin Prescher

78
3
0
3
using magnetic tape/strip and hall effect sensors to calculate linear position. https://youtu.be/lxywqETVLhE
Project Owner Contributor

open source sin cos linear encoder

Jesse SchochJesse Schoch

View all

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Alan Green wrote 11/23/2019 at 09:55 • point

Thank you for following Laser Galvo Clock!

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Simon Merrett wrote 11/23/2019 at 21:11 • point

@Alan Green de rien! 

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Kris Winer wrote 11/20/2019 at 23:52 • point

Thanks for following my People Counter project SImon!

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Simon Merrett wrote 11/23/2019 at 21:11 • point

@Kris Winer thanks for the rundown of different sensors. I'm interested in how the window / FOV blocking affects the speed of response on the calipile unit. Did it take much trial and error to get the aperture diameter and offset right? 

  Are you sure? yes | no

Kris Winer wrote 11/23/2019 at 22:50 • point

Not sure we have it right yet. The aperture doesn't affect the read rate of the sensor, at least not that I can tell but I haven't specifically looked at this. The aperture affects the change in temperature detected due to a human passing by. There is just one pixel, and the large field of view means the temperature rise is going to be averaged over a large area. For this application, it is better to narrow the field of view to obtain a larger (and I suppose faster) temperature rise rather than have the human heat island swamped by a sea of ambient background. Best will be slightly-angled but short tubes, probably designed into a 3D container. We are presently working to optimize this device, and the constriction is one of the design parameters.

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Kris Winer wrote 08/19/2018 at 15:26 • point

Thanks for following my MAX32660 Motion Co-Processor project!

  Are you sure? yes | no

Simon Merrett wrote 08/20/2018 at 09:09 • point

Thank you for educating us on the implementation of these systems. Such a need for that, compared to the resources covering the theory, which are relatively easily available. 

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Jasmine Brackett wrote 05/14/2018 at 18:07 • point

Great to meet you at Maker Faire UK!

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Simon Merrett wrote 05/16/2018 at 21:36 • point

Great to meet you too! Still got that supercap tindie badge idea rolling round my head. Made one of the normal ones with my four year old last weekend https://i.imgur.com/TXERFAG.jpg

Sadly the pin and switch seemed to be missing from the other one you gave me (for my daughter) but I've ordered spare parts.

Still hasn't stopped us from shutting ourselves in our wardrobe for a disco using the one badge!

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Afdhal Atiff Tan wrote 04/03/2017 at 07:22 • point

Hi Simon, thanks for following my battery balancer project! :)

  Are you sure? yes | no

Simon Merrett wrote 04/03/2017 at 08:41 • point

You're welcome. Julian Ilett would be very interested in this project and his YouTube channel has at least a couple of videos that discuss potential methods for efficient cell balancing.

  Are you sure? yes | no

Afdhal Atiff Tan wrote 04/03/2017 at 16:47 • point

Yup, I've seen his videos. Very interesting indeed.

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esot.eric wrote 03/29/2017 at 09:18 • point

Howdy! Thanks for the follow!

  Are you sure? yes | no

Simon Merrett wrote 03/29/2017 at 11:37 • point

Eric(?), you're very welcome! I'm interested in this project because I am interested in robot arms and closed loop control (not experienced). I'm looking forward to reading more about the potential simplicity of your concept. So far, I'm not clear how it would work without resulting in a more complex need to know the states of the other degrees of freedom before working out each element's next move. But as I said, I have no experience of this area so I'm optimistic about the findings.

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esot.eric wrote 03/30/2017 at 06:25 • point

Great thoughts, I'll address them in the next log-update! Prepare to be underwhelmed :)

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ottoragam wrote 09/26/2016 at 05:54 • point

Thanks for the follow!

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Simon Merrett wrote 09/26/2016 at 06:56 • point

You're welcome! Very interesting.

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