6
votes
Accepted
iRobot Create 2 - bypassing fuse for serial port power, other current limitations?
First the disclaimer - if you modify the robot by defeating or replacing the protection features you're on your own.
That being said here is some useful information that will hopefully help you make ...
- 181
4
votes
Accepted
Electronic circuit for heating nylon fishing line muscle
what metal should I use?
Copper wire works better than nichrome wire, according to
Homemade Artificial Muscles IV.
That says
Nichrome is used in places like your toaster mainly because it can get
...
- 4,525
4
votes
Accepted
Are robot's codes usually compiled or interpreted?
Robots tend to be portable devices powered by batteries. Portable battery operated devices tend to use embedded processors with limited power and memory. Compiled code has several advantages over ...
- 496
3
votes
How to deal with current spikes due to fast direction-switching motor commands?
I've experienced a similar problem before. For me, the root cause was insufficient battery power. When my motor tried to draw peak power it caused the battery supply bus to brown out. This led to ...
- 16k
3
votes
How to deal with current spikes due to fast direction-switching motor commands?
As explained in my answer to What is stall current and free current of motors? when switching direction on a motor, you can end up drawing more than the maximum normal current rating. This can cause ...
- 4,243
3
votes
Can high voltage power lines provide a super highway for drones?
I think yes it can but how? My options are here:
Static system for conventional systems
It should stand or hang to line/pole/special place like birds. Please watch video for an example: https://www....
- 1,104
3
votes
Accepted
Can high voltage power lines provide a super highway for drones?
Sure, a drone can land on a powerline. That's a standard task like the "peg in hole problem" for robotarms. The aim is to maneuver a UAV near to a highvoltage line and eating all the energy. The ...
- 794
3
votes
Create 2: Wheel interface board replacement
Here are a few ideas:
Buy 0.050" spacing prototyping board. For example, here are some possible boards that could work on Digi-Key.
Use a PCB prototyping service and fabricate the board you're ...
- 952
3
votes
Electronic Speed Controller
It depends on the voltage.
Say you are running 12V:
1820W / 12V = 151A
With a 24V system:
1820W / 24 = 75A
- 251
3
votes
Control signal of an LQR Controller
I've gotten stuck in a rut with grasping what the "U" control signal actually refers to in the physical system
But you've written what it is already!
$$
\dot{x} = Ax + Bu
$$
It's whatever ...
- 16k
2
votes
Electronic circuit for heating nylon fishing line muscle
As far as how to heat the nylon muscles, one of the articles that you have linked to provides a number of methods for doing so. The two most promising from an experimental perspective are submersing ...
2
votes
How to calculate the current consumed by a brushless motor on a quadcopter
n = Kv * Vin only when there is no load on the motor. When there is a load on the motor, like from a propeller, you will need to be a bit more clever.
For a DC motor (which BLDC motors approximate by ...
2
votes
Electric vs. internal combustion engine for propulsion
Q: What are the main differences between electric motor and internal combustion engine for an ATV-sized mobile robot platform in terms of functionality, implementation difficulty ("RC" conversion, "...
- 161
2
votes
Neural Nework code or library for MSP430G2553 microcontroller
One page linked says the algorithm is fine for the ATmega328's 2KB of SRAM, another is for the ATmega2560's 8KB of SRAM.
Your MSP430G2553 has 0.5KB of RAM, so I think that's the primary reason you ...
- 16k
2
votes
Accepted
How difficult it is to build simple robots (for example Line follower) using raspberry pi and ROS?
It is not extremely difficult to achieve this. It is probably a great way to learn after you complete the main ROS tutorials. Using ROS will get you free joystick or keyboard teleoperation of your bot ...
- 106
2
votes
I need the scheme of iRobot Create 2
The schematic for the main board on the iRobot Create 2 is currently not available. It is advised to remove the plastic top cover before drilling into the electronics below. (This is good practice for ...
- 952
2
votes
Accepted
Powering my robot with 12V battery which is charged by a gas/petrol generator while the robot is operating?
The alternator in a car is constantly charging the 12V battery while the car is running, which is to say battery-wise you shouldn't have any issues.
Several things could be meant when you say the ...
- 16k
2
votes
Accepted
Calculating the resistor for a buzzer
Without a more detailed spec sheet I can't say for sure, but this is my understanding:
The buzzer has a self-drive circuit is rated for input 6V max, at which point it will pull 45mA and oscillate at ...
- 892
2
votes
Accepted
Raspberry Pi and Buzzers: Simple solution
For a beginner, it is always best to follow / copy an existing example. Fortunately, a tutorial about connecting a sound device to a Raspberry Pi and parts are available here. Also, there is a ...
- 496
2
votes
Accepted
How to manipulate the magnetic field around a robot?
The magnetic field is proportional to the current. A fixed geometry coil can generate a field that is positive or negative or zero based on how much current is driven through the coil and which ...
- 4,385
2
votes
Why my stepper motor doesn't move when I attach a blade?
I will take a wild guess - your accellerating to fast for the mass of the blade / power of the stepper motor.
You can check this by trying to step much slower - perhaps 1 step per second for testing
- 274
2
votes
Accepted
Why does a motor does not run when a resistor is connected in series between the supply?
You are assuming that your voltage divider will split the 9 volts into 4.5V and 4.5V, but this relies on the upper resistance and the lower resistance values being equal.
The issue you've got is that ...
- 16k
1
vote
How to manipulate the magnetic field around a robot?
AC motors operate by generating a vector field. The field on the stator rotates, and the rotating field interacts with the field on the rotor (generated, or permanent magnets, or induced) to move the ...
- 16k
1
vote
How to deal with current spikes due to fast direction-switching motor commands?
It's maybe not this at all, but when a motor or any inductive system suddenly stop it create a short opposite surtense that can affect your microcontroleur. The solution is to ad a flyback diode ...
- 11
1
vote
How to deal with current spikes due to fast direction-switching motor commands?
You can try to put a capacitor in the motor terminal. Very close to the motor.
- 497
1
vote
Accepted
Excessive Heat Coming From Video Transmitter and Motor Electronic Boards
All boards come with data-sheets which should list the temperature range of operation for the given board.
Several video transmitter can become quite hot, thus it is recommend to have them into ...
- 1,402
1
vote
Are robot's codes usually compiled or interpreted?
Many people use Python to control robots. While it does use more computing resources to interpret the python code, it may take less time for the programmer to develop in an interpreted language.
...
- 572
1
vote
Accepted
Wire connectors
Computer fans usually use Molex connectors, however there are different versions of Molex connectors:
https://en.wikipedia.org/wiki/Computer_fan#Connectors
Small LiPo batteries often use JST ...
- 26
1
vote
Electronic circuit for heating nylon fishing line muscle
First you should to select your muscle length. It is necessary to have a constant resistance of the resulting muscles. Wind the copper wire over nylon, and then make a coiled thread.
You can use a ...
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