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Electronics / Battery building?
« Last post by headrc on February 16, 2018, 09:32:15 AM »
Hi folks, first of all I want to say thank you for a great forum here.  I have followed this forum for quite a while and love it.  I have not posted because I did not have anything really to offer that had not been covered.  Until maybe now. For my purposes I have been studying building my own batteries out of lithium ion cells (primarily 18650's).  There is a lot of great information and instructions on lots of forums/youtube etc. regarding this.  But I noticed that here, mostly everyone buys commercially available batteries and pay the markup for someone else building them.  If the process of a proper build are followed closely, it seems that you can build a good battery with more mAh that is safe and save a lot of money.  You can do it with new ...or even used cells.  My question is, if that is so, why are the folks in the robot community not pursuing this?
Misc / New product from a young robot team
« Last post by HITBOT on February 16, 2018, 09:19:19 AM »
Hello makers,

My name is HITBOT, I am focus on innovation, provide high-performance robotic arm, our new 4-axis robot arm called Z-Arm, Z-Arm is a multi-purposes desktop device, can do laser cutting, 3D printing, pick and place and a lot of things, unique appearance ensures Z-Arm can work in a extremely small cell, safety stop function enables Z-Arm can safely work side-by-side with people, hand-teaching function makes Z-Arm easier to operate. Z-Arm is not only a tool but also good-looking parnter.

Available Tool Heads:
3D Printing kit
Electric Drilling Head
Vacuum Suction Cup
Electric Screwdriver(include power supply)
Electro-magnetic Chuck
Laser Cutter
Soldering with Solder Dispenser
The 4th AXIS
Electric Gripper
Screw Dispenser
Visual Kit

For more info please go to our Kickstarter campaign:

or any questions you can send an email to [email protected]
Misc / 15% OFF Entire Site @ ServoCity!
« Last post by ServoCity on February 12, 2018, 11:29:05 AM »

Valentine's Day is around the corner so we're showing our appreciation for our customers with 15% OFF our ENTIRE SITE!

Use the discount code: ILoveDiscounts at checkout
Mechanics and Construction / Re: Assisted firing device
« Last post by usmchayward on February 09, 2018, 04:26:20 AM »
May anyone suggest a board the AT chip would go on to meet my needs?
Misc / New Servos @ ServoCity
« Last post by ServoCity on February 05, 2018, 01:40:19 PM »
Mechanics and Construction / Re: Assisted firing device
« Last post by usmchayward on February 03, 2018, 07:42:30 AM »
Thank you so very much. I am gung ho, and will follow your advice. Someone suggest a $149 remote controller for an airplane, then take it apart. The Arduino attiny is a chip, that needs to be mounted on something. What is that something I mount it on? I do not see the usb input on the chip to upload the code. I poked around the Arduino site, but I did not get any definite answer.

I can teach myself how to program this. I can teach myself how to assemble this, and trial and error get it to work. Would you be willing to recommend exactly what the parts are? Here is the chipset I found. I need to mount it on something, the microcontroller you called it.

You are correct, I only need the servo to rotate in 2 directions, with the press of the button.


Benjamin Hayward
Mechanics and Construction / Re: Robotic Hand
« Last post by artbyrobot1 on February 03, 2018, 06:44:37 AM »
Totally doable.  You can code a microcontroller such as Arduino to control the motors in the hands (a microcontroller is a small computer built into a single chip that serves as the "brains" of any electronics project).  Look up some arduino tutorials.
Mechanics and Construction / Re: brakes for robotic arms
« Last post by artbyrobot1 on February 03, 2018, 06:42:45 AM »
I'd do a ratcheting system as shown on the left half of this image:
Mechanics and Construction / Re: Assisted firing device
« Last post by artbyrobot1 on February 03, 2018, 06:30:12 AM »
Note: I know I just gave a TON of info but I thought that would answer more questions you will have faster.  Long story short - your project is VERY easy for a beginner and will take you under a day and under $5 to get the rest of the parts you need.  Take a day to research Arduino and microcontrollers and starter projects like blinking a led, getting arduino to control a motor, getting arduino to work with a button, etc.  Then you will see this project is super easy for you.
Mechanics and Construction / Re: Assisted firing device
« Last post by artbyrobot1 on February 03, 2018, 06:25:00 AM »
You need to program a microcontroller (which is basically like a TINY computer built into a little chip on a tiny board) to receive the button press as an input signal, and to then instruct the servo to turn forward or reverse for trigger deployment or release.  Microcontrollers direct servos on where to turn and how far using PWM (pulse width modulation) signals.  They are the "brains" of ANY project including yours.  You can program microcontrollers by using a IDE (software program you write your code on) on your PC and then uploading the compiled code (after you type the code, the IDE converts it to machine language your microcontroller will understand) to the microcontroller via usb.  Your microcontroller will then make the decisions you told it to make with your code you wrote based on the conditions you set for it to do the actions you want it to do when those conditions are met - in your case turn a servo one way or another to a set position when a button is pressed.  You can look up tutorials on getting started with arduino - a popular microcontroller board that comes in different sizes and has a large following and lots of tutorials on youtube.  You can use a different microcontroller than arduino since there are tons to choose from, but Arduino is a great one or beginners and will work just fine for your project.  You don't need an arduino UNO, the most popular board, because it has WAY more functionality than you need.  You just need a Arduino attiny - you just need a single input and a single output (one analog input for reading button presses and one digital output for sending a PWM (pulse width modulation) signals to the servo motor.  You will simply program the microcontroller to turn one way when it gets a signal from the button indicating it was pressed and the controller will remember it is firing.  When the button is released it will await the 2nd press of the button.  The next time the button is pressed, it will release the trigger. It will know if the button is in the state of being pressed or released based on whether or not the button is completing the electrical circuit and the microcontroller, when the circuit is completed, will read that it is receiving 5 volts or w/e from the button.  When the button is not being pressed the circuit is not being completed and the microcontroller will be recieving 0v from the button circuit.  It reads the voltage it is getting from the analogue input pins on the microcontroller board.
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