5/17
- Discuss use of tape for a body, advantages/disadvantages
- Wire wrap tool
5/14
Two places for wheels:
Need an decent O-scope (or frequency counter).
Check out ERLE: Oscilloscope
5/11 - From Vern V.
OCR2 = (clock/output_freq) – 1
…we subtract 1 because the count actually starts at zero. So my initial value should have been 209. That formula also only works if the prescale is 1. Otherwise it would be:
OCR2 = (clock/prescale/output_freq) - 1
5/10 - From Vern V.
Prescale is just a way to get around the fact that you can only count so highwith an 8 bit regist4er. The prescaler diveds the clock frequency down to a more manageable number.
5/10 - From Vern V.
Config Portb = Output
Config Portd = &B0001000
Config Portc = &B0000000
Config Pinb.3 = Output
'Config Clock = Soft
Config Timer2 = Counter , Compare = Toggle , Prescale = 1 '<<<<<>
Timer2_ir Alias Tccr2.0
'config timer2 (8 bit, CTC mode, 1:1 clock, toggle pin every 106 cycles)
Set Tccr2.3
'Ocr2 = 106
Ocr2 = 210 ' 8MHz/38KHz = 210.5 <<<<>
Enable Interrupts
Enable Compare1a
' Rename some pins for easier reading
Switch Alias Pind.0
Irleds Alias Portb.3
Leftline Alias Pinc.3
Rightline Alias Pinc.4
Leftir Alias Pinc.2
Rightir Alias Pinc.0
Frontir Alias Pinc.1
Led1 Alias Portb.4
Led2 Alias Portb.2
Led3 Alias Portb.1
Led4 Alias Portb.0
5/8 - From Gordon A.
To enter test mode, hold down start button then turn on both switches of SW2
5/7 - From Shane S.
Sub Detect(res As Byte)
Dim I As Integer
Res = 0
For I = 0 To 101
Toggle Irleds
' depending on how much code there is, adjust the following to make the IR
' pulse 38khz, plus/minus 1khz - the farther away the pulse timing is from
' 38khz, the worse the range
Waitus 3
'Waitus 4
If Frontir = 0 Then
Res.2 = 1
Res.0 = 0
Res.1 = 0
Exit Sub
End If
If Rightir = 0 Then
Res.0 = 1
Res.1 = 0
Res.2 = 0
Exit Sub
End If
If Leftir = 0 Then
Res.1 = 1
Res.0 = 0
Res.2 = 0
Exit Sub
End If
Next
End Sub
5/7 From Nathan P.
“I just spent a few minuets looking at the circuit and the code you sent me and here is what I remember from when I built the hunterbot.
The Ocr2 = 106 line is how many clock cycles it between toggling the line out.
When I was trouble shooting mine i had to tune that number in order to get the freq just right. There are a few different reasons why it is different between bot to bot. But it is made to be changed and played with in order to get the right freq out per bot. If I remember correctly I had mine working the best at around 103, The smaller the number the higher the freq out.
So my suggestion would be first to try to measure the freq out, the receivers work the best around 38 khz.
But since he doesn't have a way to measure that I would try to a range of +-10 untill they the recievers start firing.”
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