My robot is only moving forward with this program.
am usinf a SHARP IR 2Y0A21..
when i place my hands in front of it,it stops and then starts moving forward and wont turn to any side.
this is my program..-
Symbol danger = 160
symbol turn = 200
symbol servo_turn = 700
main: readadc 0, b1 if b1 < danger then gosub nodprob else gosub whichway end if
goto main
noprob: high 5 : high 6 : low 4 : low 7 gosub whichway return
Ok, I have labeled and noted on the other 3 copies of this post that you need to delete them. Please do. --And an iPod might not be the correct device to use to post here it seems…
I have taken the liberty (again) to re-format your code, insert the proper CR’s and whitespace so people can read it. There are problems with this code, but I just spent 10 minutes commenting on your other 3 posts and cleaning up this one --I am sorta out of anwering energy.
Symbol danger = 160
symbol turn = 200
symbol servo_turn = 700
main:
readadc 0, b1
if b1 < danger then gosub nodprob
else gosub whichway
end if
goto main
noprob: high 5 : high 6 : low 4 : low 7 gosub whichway return
I’m assuming this is picaxe. You know the picaxe editor has a syntax checker that would have pointed you to a number of errors you could have fixed. Formatting makes a big difference to readability. Not just to anyone helping but yourself as well to make finding errors easier. Put all instructions on separate lines as well as sub headings. I left the motor pin assignments grouped on the same line because they are quite readable this way I have commented the errors. I corrected them with the syntax checker but then ctrl_z them back again so you can learn something. Every line with an error is not commented. the same error exists a couple times on different lines. If you look at each comment and fix that line you can then see which other lines have the same mistake and fix them.
Symbol danger = 160 symbol turn = 200 symbol servo_turn = 700
main: readadc 0, b1 ;is zero correct name for adc pin? manual seems to call them [letter.number] format look at if b1 < danger then ;break up your if else statements on separate lines gosub nodprob ;spelling mistake nodprob should be noprob else gosub whichway end if goto main
noprob: high 5 : high 6 : low 4 : low 7 gosub whichway ; why are we going to whichway from here? main takes care of that return
whichway: wait 1 gosub lturn pause robo_turn readadc 0, b1 ; wait 1 gosub rturn pause robo_turn ;no such symbol robo_turn did you mean turn? readadc 0, b2 gosub stopinst ; probably better to call stop before you check left and right ;if b1 what? what are you comparing here? you need a comparison of b1 to b2 if b1 ; or a value to compare each against like the danger value gosub robo_rturn else gosub robo_lturn end if return pause turn ; these two statements do nothing as they are after the return statement gosub stopinst
robo_lturn: high 6 : low 5 : low 7 : high 4 pause turn ; using a delay to time turns is messy to adjust to right amount of time gosub stopinst return
Paul, we can help you here but we do need a bit more information to go on.
Firstly, which PicAxe chip are you using, and are you using one of the pre-built PicAxe boards or is this on a board of your own design? Also, how is the robot steering? From the code it looks like you’re controlling direction both with motors and a servo - Is this right? A good photograph of the robot and a circuit diagram would help us enormously.
The first thing that stands out in the code is that you’re using pin 0 both as an analogue input for the range sensor and an output for the servo. Pin 0 can do both, but not in the same circuit. Which pins are these actually connected to?
Post back with the answers and we’ll see what we can do for you.
Its been a while since the last time I worked with picaxe. I am indeed a bit foggy on analog/digital pin designations.
A better point of his is the version of the chip etc. The newer chips have moved on to using a letter/number combination and I can’t remember if simply using an analogRead command means the chip knows to use A0 as instead of a digital pin. Point is, more info is good.
**I think I may have been speaking Arduino for too long now… Gotta get back to the basics once and a while, it looks like. (you can take or leave the pun as you all see fit)
my servo keeps on jettring when i place my hand in front of the SHARP IR… and when i remove my hand servo wont move to any side nd my robot would jst move forward.
Hi Paul. You’ve made a symbol Servo_turn but you haven’t used it anywhere. The servo needs time to reach it’s position after you tell it to turn. The reason being the picaxe executes commands much faster than the servo can move. So you slow the processor down with a pause. Could be something else but I’d start there. Stick a Pause servo_turn in both the lturn and rturn and stopinst subs just after the servo command.
It appears we have exhausted all the “standard” stuff. At this point, you need to break everything down and do this systematically. The first thing I would do is write the simplest program you can to do the following:
Center sensor servo at start-up (leave it centered)
Drive forward
Keep checking sensor
if sensor is closer than threshold then stop (as long as something is there, the bot should remain stopped --remove your hand and the bot should start going forward again)
That’s it. Its really your code, without a servo sweep or any turning. This will tell you if the most basic flow of your code is correct. Once this is established, you can start putting your look-left/look-right back in as well as the turns.
I suspect this simple test program will uproot the problem with your main code quickly.
