It never crossed my mind to ask the manufacturer, I will try that now.
Thanks The motors have 2 wires. Do I need all 4 motors to run the car?
Or the shop that sold you the stuff, of course.In your case you may be better off ordering stuff off the Internet, then at least you can order things you have technical documentation of (make sure you have that before you press the Buy Now button).I'd say so. The wheels won't run smoothly by themselves, with those motors attached.
I think you have put the cart before the horse.E.g. my friends said they would give me a horse, so i ran out and bought a cart to be towed by a horse, then my friends turned up with a minature pony that fitted IN the cart.Not knowing the voltage and current you will be able to provide means you are making some bad decisions based on assumptions with no basis in reality.Break the project down.First assemble the power sourse and do some tests to find out what you have.1. How much does it weigh?2. How big is it.3. What Volts can it supply at What Amps?4. How long will your supply last and how long do you need it to last. You mentioned using thermoelectric generators and making up two aluminum containers to hold your hot and cold water.Do you realise that the aluminum will radiate heat on all 5 sides not just the side you attach the generators to?Maby you could use two insulated containers with one wall replaces by aluminum sheet and sealed around the edge with silicone, giving you a surface for the generators.Do some tests on your carrage to see how much current (Amps) it takes to drive it?This is the start, you will have facts to let people know so they can help you
I.e. go back to the questions I asked you way back in post #1 and find a few more answers. Without them you have no idea if anything will work. E.g. if your generator can't produce enough power to run even one motor it doesn't matter whether the chassis needs all four motors or not you still won't be going anywhere.Steve
I think your next job is to build and measure the thermoelectric generator.Satellite ones use Pu240 at about 1000K as the source, and radiate waste heat into space at a very low temperature.I don't think you'll get much from hot and cold water.Allan
Honestly, I have heard of Raspberry Pi but not of Audrino. It is listed in the thesis they want me build, that is the first time I heard of Audrino.
The Arduino is better suited to this than task than the Pi and simpler to setup. However since all you are doing is starting the car, running it in a straight line and then stopping (no steering or any significant control) I am not sure that a wholly electrical solution might not be better - but I don't know much about electronics.You might find the motors generate a different amount of power when given the same voltage. So a bit of experimenting to pair the motors up might help so that both motors at the rear are similar and both motors at the front are similar. You could also experiment with just two motors and having front or rear drive. Presumably you will just lock the steering so that you go in a straight line.I was surprised to read recently that the UAE are major importers of sand. Does Bahrain import a lot of sand as well
Hi again,Was just checking back ansd thought i would add some thoughts.To everyone. This project seems to be about chemical engineering so it is required to use chemical methods to generate a drive for the car eg thermal to electric (Although as a laugh i would love to present a peterol driven car claiming it has both a chemical and thermal element while powering the wheels)The second part is a chemical timer designed to stop the car after a period of time.Much as we think the arduino can do it that is not the purpose here.The paper that you linked to had a lot to say but left out a lot of details.How did they end up configuring the thermo generators? What model generator did they use? What voltage/current did they end up getting?Starting to repeat my self here.Any how you have a few areas to cover.This is just a broad look at the planing ahead that i hope will allow you to come up with more questions.The Generator:You will need some electrical know how and a multimeter as what you have is several (think they mentioned generators that will output a certain voltage at a certain current and you will have to wire some in series to obtain 6 volts (going by the photo of your 4 wheeled chassis i see a battery holder for 4, 1.5 volt AA batteries that appear to be in series giving you 6 volts)and you will then have to wire others in parallel to increase the current to a level to drive the motors.Notice how they used "SEVERAL BATTERIES" to simulate the thermo electric supply for testing.The Timer:The LED and the LDR are just used as a light detection circuit, ( lot like the street lights but in reverse ) when the light level is high eg the liquid is clear, the car engine is turned on and when the light level drops below a predetermined level the motor is turned off.This happens as the liquid in the tube goes from clear to foggy. I dont think the colour matters.The main purpose is for you to figgure out the balance of chemicals to change the liquid from clear to opaque in a preset time .The arduino will give you a number between 1 and 255 as the liquid inhibits the path of the led light through it.You can find many examples of code for this.The Drive Chassis:You are going to need that multimeter (dont spend heaps or borrow one, needs to measure up to say 50 volts DC and 10 amps DC).Google 'using a multimeter to measure current and voltage' Go Youtube!Set up the battery pack and connect it to one of the motors with the meter set to measure current, this will give you a starting current for one motor. Note that the current may/will go up when you actualy add strain/load to the motor.When you connect a wheel to the motor can you turn the wheel with ease? (called freewheeling) if not then you will need to run all 4 motors to make the buggy move or you will have the unpowered wheels acting as breaks.Depending on the current available from your thermo supply you may run two motors and just run a shaft on the other two wheels.There are many motor driver boards available for the arduino or just a simple relay board. No need to get complicated with transistors or fetts as you will have enough to do as it is. Try to stick to off the shelf, ready to go stuff.You might want to check on the speed of that chassis loaded with some weight.The Arduino:Here i fall down as my programming is all theory but there are more here than just meNote they dont say it but the graphic of there cart shows a 9 volt battery that i suspect they are using to run the Arduino as i think your thermal battery will be to unstable running the motors and the Arduino.The project is to drive the car and use a chemical timer, nothing said about running the Arduino.More to think on!
Just to know if I understood right, using all 4 motors would require more current over using 2 motors. Could the load/weight increase require more power on 2 motors over 4 motors?
Regarding the LDR; The iodine clock reaction turns the mixture from clear liquid to blueish black mixture. It pretty dark, Think the LDR could pick up the change?
Bahrain used to export sand until they started to run short.Tiny is;and really. I don't know what they were thinking.
I will get to the motors as soon as i figure out the wiring.Regarding the LDR; The iodine clock reaction turns the mixture from clear liquid to blueish black mixture. It pretty dark, Think the LDR could pick up the change?The multimeter is available witht he university, so I'm glad I don't have to buy that. No, there is no freewheeling feature for the buggy. Just to know if I understood right, using all 4 motors would require more current over using 2 motors. Could the load/weight increase require more power on 2 motors over 4 motors?When you say run a shaft between two wheels, you mean pass a pipe between the wheels yeah?The shop guy advised me to consider L293D sheild board saying it is purchased often. What do you think.You have a point about using the audrino with battery. Thank you again!Once again I really appreciate all the efforts you and the community here has been putting to help me out. You guys are really awesome.