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Crossed from: Inside Circuits | Clicks: 19921 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
2 Axis Solar Tracker Circuit
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The sun trucker uses a combination of three photoresistors R7, R8 and R9, to ensure that the circuit will follow the sun during the day, but stop working at night time. Make this circuit 2 times to have 4 Axis move, by using 2 motors...
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Crossed from: Motor Control Circuits | Clicks: 18765 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Single IC chip Motor Driver for robots
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A motor driver! I'm sure you knew that already but that's what it is. A motor driver is required in pretty much all walkers including all of my CW series walkers. You need to use it any time you need to supply more current to the motors because the circuit can't supply enough. I like this one because it's very easy to build and pretty flexible on what you can do with it. Just find the (M) and take the two connections going to it and hook them to the inputs of the driver. Stack 'em up Q - When I hook my motor directly to the battery it has lots of power but when I hook it to the motor driver it doesn't and can't even move my walkers leg. ..
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| Clicks: 442 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Suspended Bicore circuit for robots
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The bicore is the basis of advanced BEAM! Most intermediate to advanced BEAM robots are built off of the bicore. Uses go all the way from photovores to servo motor drivers to walkers to.... You get the idea. What it is is basically just an oscillator who's outputs go (+ - , - +, + -, - +....) and the rate of oscillations is controlled by the resister (R1). Another cool thing is that they can be grouped together to form large complex structures. Really a very cool circuit once you figure out how it works. R1 R1 controls the rate of oscillation. If you want quick oscillations you use a low value resister, long oscillations you use large value resister. I normally don't use values below 100K or over 10M, 1.6M is a common value...
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| Clicks: 14499 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Tactile sensors Motor controller
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It's basically a photovore with a couple tactile sensors. It's rather complex but can give neat behaviors with modifications to the circuit. At this point I don't have any plans to give more information on this circuit so your on your own. C1 and C2 values C1 and C2 are the capacitors that control how long each motor will reverse after the tactile sensor is triggered. Increasing the value will cause your bot to turn more after bumping an object. Decrease and it will turn less. The layout All resistors are 1M unless labeled otherwise. All capacitors are .22uF unless labeled otherwise. This circuit is more for advanced BEAMers so if your a newbie to BEAM I would recommend the iVore circuit. I may get some more info on the circuit on the web but no plans yet...
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Crossed from: Solar Cell Circuits | Clicks: 4014 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Solar motor driver for small robots
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Since you can only use motors and coils with this circuit robots built with this circuit are mainly mechanical such as my artistic butterflies. One other common use is a little thing called a symet which can roam around and not get stuck using only one motor. The solar cell starts charging the capacitor and the voltage rises. As soon as the capacitor reaches around 2.7v the 1381 turns pin 1 high and turns the 3904 ON. When the 3904 turns on it brings the base of the 3906 low which turns it ON. With the 3906 ON current is supplied to the base of the 3904 which keeps it ON. Now current can flow through the motor and it turns. When the voltage gets down to .7v the transistors turn OFF and the process is repeated...
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Crossed from: Various Circuits | Clicks: 12043 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Audio Detector switch
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The following circuit can be used to detect those annoying piezo whistles that one can get from Radio Shack. For the Trinity Home Fire Fighting Contest, additional points accrue when the robot is started by a sound similar to a fire alarm. The actual whistle is specified as a particular Radio Shack piezo element, but the following circuit should be tunable across a wide range of pitches...
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Crossed from: Solar Cell Circuits | Clicks: 15293 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Solar powered robot
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Make your own solar powered robot at home using things you probably already have. Transistors, resistor, capacitor, solar battery and flashing LED are available at any electronic store, if you don't already have them. Solar cells out of calculators work as well, you might want to use more than one since they are really small. If you do, connect the positive wire from each solar battery together. A small motor should be used like the ones in walkmans. Solder everything together and watch it come alive. Put it under a light and let it charge, it should take couple seconds for each burst of energy. Works best in sunlight...
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| Clicks: 1106 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Talking Yoda head
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The talking Yoda head consists of a Yoda mask and a microcontroller system to achieve the desired operation/effect. The basic operation of the project was specified as follows: The head was to be placed inside a closed box. Upon opening the box, the light sensor sends a signal to the microcontroller which, in turn, activates the ISD1000A to play message number one. The audio output is fed back into an A/D converter and processed in the microcontroller to make the mouth mechanics move via servo control. When the box is closed again, message 2 is played. Upon reopening of the box, message 3 is played and then message 4 is continually played until the box is closed again. When the box is closed again, the system resets and prepares to play message 1 again when the box is reopened...
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Crossed from: Light Sensing | Clicks: 15358 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Sun Light Chaser
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With RFT illuminated, point R goes to 0 volt and LM runs. With LFT illuminated, point R goes to 0 volt and RM runs. With RFT and/or LFT not illuminated, points R/L go to +9 volt; P1 and P2 controls threshold point when RM/LM stop or start running. Remember to seperate FT1 and FT2 with a vertical cardboard wall in order to produce a shadow over the other FT whenthe first is illuminated by a lateral incident light...
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| Clicks: 11514 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Robot Beacon with PIC12C508A
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We hold the "first rights" to the presentation of this approach and the best part is: "It's FREE!"
The PIC12C508A is one of the most amazing devices but because it does not come in a low-cost re-programmable form, it has never been presented in a "designers article." It is a one-time programmable device (OTP) and once it is programmed, it cannot be re-programmed.
To develop with this chip is not an economical decision as it may take 30 to 100 modifications before you are completely happy with the operation of the software. That's 99 wasted chips!
The only way to carry out experimentation is with the EPROM version (window version). These carry the part number PIC12C508A-JW and are about 10 times the cost of a normal PIC12C508A. ..
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Crossed from: DTMF Circuits | Clicks: 3682 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
DTMF decoder with voice!
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The Talking Phone Dial Monitor detects the
tones generated when numbers are dialed
on your touch tone telephone and speaks
the numbers that were dialed. This verifies
that you dialed the correct number and is
especially useful when the keypad is not
well lighted or if the person dialing cannot
see the keypad well for any reason. The
numbers that are spoken can be prerecorded by speaking into a built-in
microphone and can be re-recorded at any
time if desired...
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| Clicks: 10210 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
IR Encoder/Decoder with PIC12C508
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The receiver chip uses a Panasonic 4602 38KHz receiver and that's it for external components. It has the serial input (GP3) , two RC hobby servo outputs (GP0/GP1) and three digital outputs (GP2,4,5). Here is the code for the receiver chip. It is a bit of a specialty in that the digital outputs are actually "momentary contact" type outputs because I only needed a pulse to go out to trigger a cheap sound board I got from a $6 toy! I don't even use the GP2 output in this design. The receiver uses 4 NiCd 115MAH cells, the largest set I could fit into the Rhino! The transmitter chip uses 5 pullup resistors and an IR LED powered through a 330 resistor - quite a bit of power I think. To keep things simple, I used a 78L05 to power the PIC so I could use a 9V battery and keep the whole project box size small. It will run fine on 3 alkaline cells, or, from 4.5 to 5.5V. ..
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| Clicks: 9941 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Furby robot using PIC16F819
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There are several websites documenting the original Furby circuit board. I decided to replace the original circuit entirely and replace it with a PIC based controller. The mechanism of the Furby itself was designed around micro- controllers. It has one motor that runs the eyes, mouth, and ears in sequence. Two sensors are provided from the motor servo system: one counts off about 200 pulses for the entire sequence, the other is an 'index' pulse that lets you find the start/end of the sequence. Several other sensors are provided including several switches, IR sensor, photo sensor, and microphone. The outputs are to the IR system, motor, and speaker...
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| Clicks: 6649 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Incect Robot circuit (PIC16F818)
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Very little extra circuitry is needed to do both forword and backword walking sequences along with a few other tricks. The PIC16F818 has a lot of features that work well in this situation. As you can see from the Schematic and Source Listing, position pulses for the 2 servos are generated dirctly from the PIC. Also, the room light level, battery condition, and servo power draw (indicating mechanical loading) can be measured with the internal A/D. The battery condition (although not yet in the software) can be determined by reading voltage accross the LED. Since this voltage is (somewhat) constant, reading it actually measures the VCC to the PIC, which is where it gets its reference voltage. A higher reading on the LED means the battery voltage is lower...
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Crossed from: PIC Microcontroller | Clicks: 3968 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0
Spider robot with PIC16F84
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To get enough outputs from the PIC chip, a pair of 74HC164 shift registers was used. These need only two lines from the PIC (data & shift) to produce the twelve signal pulses for the servos. A single bit is shifted into the first shift register, then, after a specific delay, it is shifted to the next servo. The second shift register cascades off the first. This system can be extended for any number of servos. The idea of this design is that no power is needed when the legs are in the full down position. They also create a lot of extra leverage at the bottom of travel. This helps overcome friction as the leg is moving horizontally inward at this time. When the leg is raised, the velocity increases with height making it easy to raise the leg over an inch...
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