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91  Using Arduino / General Electronics / Re: Theory behind voltage double/tripplers etc (dc) on: June 23, 2013, 12:45:11 pm
Couple of pics of a 2 cell driving a 5volt lcd. A lot of 5volt lcd's are able to be driven by 3.3V but the contrast must be driven by a voltage that is negative. So I'm using the circuit seen in the one pic (the 2 diodes and the 2 caps)to create a negative voltage fed to the contrast thru a pot to control it. The circuit is driven from one of the timer0 output pins which means it just runs without any need to be updated by software control, just the initial setup.
92  Using Arduino / Motors, Mechanics, and Power / Re: Generate PPM signal with arduino on: June 07, 2013, 12:22:22 pm
Basically the board takes the signals (PPM -PWM  call it what you like) from the receivers slots intended for servos or esc hence the four slots for throttle, rudder,elevator and aileron on the input side of the board. Then the board depending on what the dip switch is set at will allow the control of mainly esc's at 400Hz or servos at 50Hz PWM intended for multi rotor craft.

While you are waiting for it here is the manual ( took a little digging- could not find it on HK's product page).

93  General Category / General Discussion / Re: Relay 5v for arduino on: May 30, 2013, 04:59:24 pm
Well who would have thought?

From the product description.

This is a 5V 2-Channel Relay interface board, Be able to control various appliances, and other equipments with large current. It can be controlled directly by Micro-controller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic) .

•5V 2-Channel Relay interface board, and each one needs 15-20mA Driver Current
•Equiped with high-current relay, AC250V 10A ; DC30V 10A
•Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic)   
•Indication LED’s for Relay output status
94  General Category / General Discussion / Re: Relay 5v for arduino on: May 30, 2013, 12:30:03 pm
The product (from ebay) mentioned in the OP's post is able to be controlled without using transistors. Just hook it up straight.
95  Using Arduino / Motors, Mechanics, and Power / Re: I am looking for a stepper motor driver that can handle up to 5A on: May 24, 2013, 06:33:44 pm
At a buck an amp this might be worth a try.
96  Topics / Robotics / Re: Micro Robot Arm: Question about arm joints on: May 17, 2013, 11:35:25 am
Maybe something like this might do.
97  Topics / Robotics / Re: Need Help: 6wd WT w/ 6dof arm on: March 09, 2013, 12:12:50 pm
Have a look at this:
98  Using Arduino / Motors, Mechanics, and Power / Re: how to make 4 wires system of Unipolar Motor control into 2 wires on: February 17, 2013, 02:57:19 pm
It can be done using a couple of logic chips.
99  Using Arduino / Motors, Mechanics, and Power / Re: Holding an 11 mm shaft with non-metric pillow blocks on: February 02, 2013, 09:51:43 pm
For press fit stuff like bearings in housings heating the housing and putting the bearing in a cold environment before assembly would be used depending on circumstances. But has been mentioned just slitting the bronze sleeve (hacksaw or whatever) will allow the sleeve to go into the pillow block. If you are using collars on the shaft or whatever is attached next to the pillow block then that would keep the sleeve from coming out.
100  Topics / Robotics / Re: Robotic Arm Project on: January 14, 2013, 01:31:20 pm
Take a look at this
101  Using Arduino / Displays / Re: Serial LCD on: December 30, 2012, 05:38:38 pm
Parallax is trying (somewhat) in getting their products to work with the Arduino so it takes a little digging to find stuff.

They have  "Kickstart" (which looks like it has been moved recently) but it looks a little thin in programming examples for now.

Here is the page.
102  Topics / Robotics / Re: help with the maths of a simple robotic arm on: December 01, 2012, 05:17:38 pm
Take a look at this and see if it will help you.
103  Using Arduino / Microcontrollers / Re: Using external ADCs with higher resolution than the MCU itself. on: November 27, 2012, 07:40:10 pm
Take a look at this appnote from Atmel.

104  Using Arduino / Project Guidance / Re: sort of delta robot/polygraph on: November 21, 2012, 03:57:16 pm
The tube being fixed at one end and the other end of the tube moves then the moving end becomes a point on a sphere.

Look into spherical to rectangular conversion.
105  Using Arduino / Installation & Troubleshooting / Re: Breadboard Arduino (ATMega328p) upload problems on: November 20, 2012, 07:50:01 pm
Don't know if a 1pf cap versus a .1uf (what your Pro Mini has on it) matters but the .1uf has an order of 100,000 times over the 1pf.

You might want to try and kick your cap up a bit. Just use a tpyical bypass cap.
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