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Electronics / Re: DTMF 8870 Circuit Explanation
« Last post by robotprince on Yesterday at 05:47:50 AM »
Hi,

After reading this forum, I got some interesting info about 8870. But I came to know that when we press a button in the mobile phone, it splits into two frequencies (i.e. high and low frequency) which will produce a single tone. This tone is sent to 8870 IC through headphone jack and they are separated by bandpass filter. Then they are decoded using digital counting techniques to receive the digital output.

Nothing much, just wanted to share my knowledge.

Source: http://blog.jayroboticsclub.in/how-ic-cm8870-works-as-dtmf-receiver/
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Misc / Re: My buddy Tim's HUGE robots
« Last post by gtabasso on April 27, 2016, 05:34:32 AM »
He builds them in six months but works on them 24/7. I wrote a blog post about him. He builds mechanized monster trucks, too. You can read the blog here if you are interested in learning more:
https://hgrinc.com/self-taught-cleveland-man-builds-monster-trucks-huge-robots/
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Misc / Re: My buddy Tim's HUGE robots
« Last post by johnnywheels on April 26, 2016, 06:39:34 PM »
These are two of my buddy Tim Willis' robots. He's working on a 50-foot fire-breathing dragon right now. This is what he does fulltime! Build robots. He's bringing them out to my office on Thursday for an event we are having so he can show them off to the high school's Robotics Team. He actually lives IN his garage, sleeps a couple hours and works around the clock. He drove to Florida and back in a day to get parts for the dragon. My friends are amazing makers.

They certainly are!  This is incredible!!! Hope to see more pics as the dragon evolves, thanks for the share, will definitely be checking in!  Do you know how long he usually works on the project from start to completion?
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Misc / My buddy Tim's HUGE robots
« Last post by gtabasso on April 26, 2016, 09:31:13 AM »
These are two of my buddy Tim Willis' robots. He's working on a 50-foot fire-breathing dragon right now. This is what he does fulltime! Build robots. He's bringing them out to my office on Thursday for an event we are having so he can show them off to the high school's Robotics Team. He actually lives IN his garage, sleeps a couple hours and works around the clock. He drove to Florida and back in a day to get parts for the dragon. My friends are amazing makers.
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Misc / Anyone have experience with Castle Creations Inc.?
« Last post by gtabasso on April 26, 2016, 09:18:05 AM »
I bought two robotic controllers from Castle Creations, Inc. and ordered EXPENSIVE overnight shipping. The item arrived two days later and was sent to the wrong person (the name on the credit card rather than the ship-to name; so, we almost didn't get them in time to solder.
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Misc / Re: Sales/swap/exchange section in the forum??
« Last post by gtabasso on April 26, 2016, 09:12:53 AM »
My company buys and sells industrial surplus, including robotics. You may want to check out the website since stuff comes and goes every day.

What's the name of the company?

HGR Industrial Surplus
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Mechanics and Construction / DC motor
« Last post by Nikesh Kumar on April 26, 2016, 08:08:16 AM »
Hello frnd..
I am Nikesh
Iam doing a project based on Agribot. In my project I have used four DC motors to run four wheels of my vehicle .
I have connected motor shaft directly to wear to minimize the losses.
My question is that i haven't used any gears.  so how far it is good and how much it is advantageous than geared system. the total weight is 5kg..  please reply me fast
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Misc / Re: Sales/swap/exchange section in the forum??
« Last post by johnnywheels on April 25, 2016, 04:01:21 PM »
My company buys and sells industrial surplus, including robotics. You may want to check out the website since stuff comes and goes every day.

What's the name of the company?
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Misc / Re: List of books, websites and sources for parts
« Last post by johnnywheels on April 25, 2016, 03:58:52 PM »
   I have compiled a list of books, websites and sources for parts, related to robotics and electronics, that I have found useful and interesting. Hopefully this will be useful to you if you are searching for parts or information.

This is nothing short of gold, thank you!!!
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Mechanics and Construction / Re: CS student help needed in motor selection
« Last post by bdeuell on April 24, 2016, 01:18:11 PM »
there is some information in the tutorials section regarding calculating motor torque. search the posts and web as well.

a couple notes:
- what units is your speed in?
- you will probably need a gearbox (or some other speed reduction)
- what acceleration do you need?
- what surface is it driving over?
- does it need to go up any incline if so how steep?
- how much will the robot weigh (i'm assuming the weight provided is for the payload)?
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