Picaxe28 and HC-SR01...i'm stuck before i even start...eeek!

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Hi guys and gal’s... my first entry into this world is a question about the “start here” robot...

(ok maybe more than one question)

 

I have:

Picaxe 28X1

towerpro 9g micro servo's

HC-SR01 ultrasonic sensor

Tamiya double gearbox (with FA-130 [3v] motors)

some wheels and a bit of rubber track

 

What can I say...E-Bay made this project affordable but not quite as easy.

 

  1. I'm going to put little poles into all the relevant holes on the picaxe (so I dont have to add more at a later date) do I risk short circuit or static damage with poles directly accessing the picaxe chip?

  2. The motor likes 1.5v-3v, motor driver 4.5v+ (but causes a 1.5v drop to the motor), picaxe is happy with around 5v, batteries will supply 4.8v (4x1.5v rechargeable s) but the sonar I’ve been told is fussy about 5v MINIMUM. Is this going to be a problem and if so whats the best way to sort it out...dual picaxe v+?

  3. is the HC-SR01 the same as an HC-SR04 as far as I’m concerned?

  4. Whats the best way to attach track wheels to a central board?

 

I know its a lot – I’ll work out a little more finesse later but right now I’m struggling to start as things keep slowing me down.

 

Thanks peeps

 

dom (aka blue beta)

 

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After getting some more info from you in the Shoutbox,

I will attempt to answer your questions to the best of my knowledge.

1. Filling all the holes with your included headers will be fine. You have seen arduino boards with many unpopulated pins and they don’t have problems.

3. The HC-SR01 seems to be the same electrically. So, you should be fine. It may, however, have different sensing characteristics; wider beam width, shorter distance sensed.

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thanks birdmuncos im a bit

thanks birdmun

cos im a bit new i wasnt sure just how sensitive pics were to direct contact.

as for the HC-SR01 … i suppose it will be a case of experimentation with the picaxe but at least i know they are relatively the same.

BB

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HC-SR01 does not exist

I know, I asked the googles.

Actually, I googled HC-SR01, I hit Ebay, I did amazon. I tried HCSR01, HC SR 01, HC-SR-01 ect. and unless you are into Asian shipbuilding or you are trying to use a geared starter motor for a Ford truck, I think it might not be a HC-SR01.

Do you have a link for what you bought?

To get your 5v. The easiest thing to do is to go up to a 5-AA or 6-AA pack and use a votage regulator. You can get one all put together on Ebay for a few quid or you can buy the regulator itself and build your own circuit. It is super simple really, just a couple caps to add. The part is called the LM7805 and is about as “standard” as they come.

The batteries would feed into this regulator and a steady, clean 5v comes out. That 5v, on a simple SHR-style robot, would go to everything --servo, motors, brain, sensor. 

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muppet

i just checked again…a bit of dirt was making the 4 look like a 1…sorry

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the end

i think the bases are covered for now …so thanks peeps…time to start building the bugger