70016 Parallax Inc, 70016 Datasheet - Page 20
70016
Manufacturer Part Number
70016
Description
TEXT INFRARED REMOTE FOR BOE-BOT
Manufacturer
Parallax Inc
Datasheet
1.70016.pdf
(212 pages)
Specifications of 70016
Accessory Type
Manual
Product
Microcontroller Accessories
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
Boe-Bot®
For Use With
29122 - KIT PARTS IR REMOTE FOR BOE-BOT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
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Let's say your program has a word variable named
duration. The 2.4 ms, 1.2 ms, and 0.6 ms pulses shown in Figure 1-7 are negative pulses.
To measure them with the IR detector circuit, you will have to use the command:
The high time between two low pulses can be measured as a positive pulse. True, it
doesn't contain any data, but it can be useful for figuring out how long an entire IR
message takes to transmit. By changing the
to 1, you can measure the duration of a positive pulse, like this:
Example Program: CountStartPulses.bs2
The first pulse that we will examine using the
This pulse won't be exactly 2.4 ms (2400 µs), but it should be fairly close, give or take
250 µs. This is the pulse that signifies that twelve more data pulses are about to be sent
by the remote.
PULSIN 9, 0, time
PULSIN 9, 1, time
High pulse vs. low pulse: If the voltage a BASIC Stamp I/O pin senses starts low, then
goes high for a while before returning to low, that's a high pulse. The term positive pulse
is also commonly used. The
high if the
A low pulse is the opposite: the signal will be high, then drop low for a while before
returning to the high state. It is also called a negative pulse. The
measures the amount of time the signal is low if the
State
argument is 1.
PULSIN
command measures the amount of time the signal is
PULSIN
PULSIN
time
command's
State
command is the 2.4 ms start pulse.
for storing the measured pulse
argument is 0.
State
PULSIN
argument from 0
Figure 1-7
A Closer Look at
the Pulses
command
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