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Recent Posts

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Robotics / Scorbot-ER V+
« Last post by jirik on June 16, 2020, 03:58:39 PM »
I found an Eshed Robotec  Scorbot-ER V+ robot and controller from recycling bin of local school.

Robot had some parts missing, but found them too (one belt tensioner and all of the home limit sensor drums.) Robot is now assembled and seems to be about working.

I soldered a rs232 cable (null modem: ground and two signal wires, with 2+3 pins in the D9 connected together.) D9-D25. Dos based software in Win XP command prompt wasn´t able to communicate with robot but can. That is an evaluation version and needs a activation code. Maybe I have to continue using the robot with Hyperterminal a month from now...

At the moment robot is mounted on the control cabinet top cover with three M6 screws.
Robot - 8mm Aluminium plate - Cabinet top cover. Is not-so-sturdy base source for trouble?

Problems encountered so far:
- Axis 1 and 2 -> Worn bearings/gears in the servos. Fast homing (pc control) usually fails, slow homing started by teach pendant usually finishes. Are spare parts available for those gearboxes?
- Axis 2 - if arm is about horizontal, I get error of "IMPACT AX[2]" if trying to move that axis 2 up faster than ca. 38% speed.
General Discussion / HELP with Schematics for magnet launcher
« Last post by CLD on July 09, 2019, 06:23:19 PM »
I am recreating the induction launcher in this YouTube vid:

I have all of the parts:
2 tranformers
4 resistors
bridge rectifier
4 capacitors
Electromagnet coil

I don't know how to read the schematics - HOW do I connect all of the parts and where for each?

Get back to me so we can talk about it.

Electronics Hacking / electronics hacking
« Last post by srikaki on July 03, 2019, 09:08:58 AM »
Hi you are talking about electronics hacking and  error for more I think u can do this for more u need to contact Google, thanks
Post your projects / Timer circuit for led
« Last post by TomDTC on April 03, 2019, 05:37:33 PM »
How to make a simple circuit. This needs to fit inside of a cylinder about the size of an ink pen. Powered by a dc battery, (inside the cylinder) when voltage is applied, via a push button switch or a thurmail sensor, that starts timer/delay preset for 60 seconds then lights the led.       
Basic Electronics / PEMF and RIFE dual circuit schema questions
« Last post by drhiii on March 26, 2019, 09:53:40 PM »
I have a very amateur level of competence when it comes to electronics, circuits, etc.  Am looking at a Youtube project that combines a PEMF device (Pulsed Electromagnetic Field Therapy) and a RIFE device (Royal Rife, Tesla, etc).. dual circuitry.  There are two or three elements in the hand drawn schematic that I do not understand and was hoping someone could put eyes on it and identify those pieces.  I have sourced almost all of the parts, but a parts list would really have helped.  I’ve tried to ask the originator of this schema but have yet to receive any replies.  The engineer who drew this up posted barebones schema and vid, and I can almost get through it.  Almost.  So looking to this learned group for any help to interpret this schema and video. 
Am attaching an image with 2 balloons w/text and pointers asking “what is this?”, etc.  Plus an additional question is… on the front panel there appear to be two, or three different kinds of lights.  Are they all the same(for pulse, pulse, out, out and power), as in LEDs?, Or might they different kind of lights for the three different types/labels.   Cannot discern from the schema and vid. 
Am also attaching some images that snapshot the project, taken from the video.
Any advice would be most helpful.  At the least
Fwiw, the end game of this is the PEMF aspect assist my wife who lives in chronic pain (6 total joint replacements for instance).  Additionally, she is a liver transplant recipient.. so lots going on here.   The magnetic pulse fields do provide a measure of relief.  Hence why am pursuing this. 

Youtube link:

Electronics Marketplace / oscilloscopes for sale
« Last post by callittwo on January 11, 2019, 07:24:28 AM »
I have two oscilloscopes for sale
Hamed 407 and LG 5020

£120 for the hameg and £60 for the LG both in full working order,anybody is more than welcome to come and have a look,Im in sheffield s36 4gy in the uk  tel:07891903013
Electronic Parts / Re: want to connect my Arduino UNO
« Last post by AJ_36 on December 06, 2018, 08:55:13 AM »
Hello !

I want to connect my Arduino UNO to a One Relay Switch Board.
I also want to connect relay to a Fan, TubeLight etc

Relay connections :  POLE, NO, NC,

Please can any one explain me the connections Please.


It is very easy to connect a relay to Arduino or any micro-controller for that matter. Since you have mentioned "Relay board" I am assume it has the relay driver circuit build on it.

If you can find a transistor, resistor and diode on top of your board then it probably has the driver circuit. If not make sure you add one else your Arduino will not be able to provide enough current for your Relay to trigger.

There are many types of relays the one you have is possibly a 5V 5-pin relay. You should connect the load, in your case light fan etc to the  POLE, NO, NC (any two) pins. Also note that pole pin is commonly refereed to as common pin also. You can find more details of the relay in the below link.

You AC loads will have two terminals Phase(live or hot) and neutral. Connect the Phase wire to the Phase of your AC mains. You will add the switch (relay) only to the neutral side. Connect the neutral wire to the pole pin of your relay and then connect the NO pin of the relay to the Phase.

This way your load will be turned off till the relay gets triggered. When the relay is triggered form the Arduino, the neutral will be connected to the AC main completing the circuit and thus turning on the load.

I know its a very late reply, but hope it would help people to come in future.

Motor Control / Re: BLDC sine wave using a L298n
« Last post by orion_pt on January 05, 2018, 12:02:24 PM »
I'm doing exactly the same and having the same problem as you. I also increased number of steps and it improved. The 10 bit resolution makes it worse but reducing the pwm speed makes it better but you get the frequency noise. I think the 298 is having problems with pwm signal creating noise in the output. Could it be necessary to have DAC between arduino and the 298 or a different driver would be a better choice?
Motor Control / BLDC sine wave using a L298n
« Last post by navanod on January 03, 2018, 04:05:26 PM »
Hi all and greetings.

I have been working on a BLDC project for a while trying to use the sine wave tables to generate like it was shown in the stroboscope project.  I do get movement but it is certainly not as smooth as I would like,  I have tried more steps and this helped a little but still not great.

I am wondering id this is really not the fault of the l298n?

Ive got one dev kit from TI here for a fancy fan controller and at 7 hz the same motor is silky smooth.

love to hear your thoughts on the old L298n for slow speed bldc control.

Electronics Repairs / Re: List of Seagate firmware terminal commands
« Last post by SALIM on December 16, 2017, 10:30:04 AM »
Hi to all

i need help for LEVEL 2 and LEVEL 7

Level 2 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Level 7 'I': Rev 0011.0001, Overlay, DisplayModifyAdaptiveParm, I,[GroupId]

Please few words,  how to use this CAPITAL I


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