70016 Parallax Inc, 70016 Datasheet - Page 84

• Manufacturer Part Number: 70016
• Description: TEXT INFRARED REMOTE FOR BOE-BOT
• Manufacturer: Parallax Inc

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

The Speaker Circuit
Whether it's a keypad on an alarm system, microwave oven, or a Boe-Bot, a speaker
really helps let you know that the device understood when you pressed that digit key.
The speaker shown in Figure 2-6 was already added to your Boe-Bot in Chapter 1,
Activity #4. Up until now, it was only used to let you know that the program started (or
spontaneously restarted due to low batteries).
In this activity, we will also use the piezospeaker circuit to signal that the Boe-Bot
detected and understood when you pressed a button on the remote. This is especially
useful for typing multi-digit values on the remote's numeric keypad. You will also write
commands to send different tones indicating the wrong key was pressed.
Converting Sequences of Digits to Decimal Numbers
Let's say you want to send a larger value to the Boe-Bot, like the decimal value 635. To
send this number, you will have to press and release the 6 , then the 3 , then the 5 , then the
ENTER key. The BASIC Stamp will have to successively receive each digit, multiply by
ten, then add the next most recently received digit. When the ENTER key is pressed, the
value 11 is sent, which means the multiply by ten and add routine is finished. Here is a
step by step list of how the BASIC Stamp has to process the incoming messages to
rebuild the value 635:
√
•
•
•
•
If you have not already done so, add the speaker circuit shown in Figure 2-6 to
your Boe-Bot's prototyping area.
The digit 6 is received, so store 6.
The digit 3 is received, so multiply 6 by ten, then add 3.
The digit 5 is received, so multiply 63 by ten, then add 5.
The value 11 is received, so keep the value 635 and exit the routine.
P4
Vss
Figure 2-6
Speaker for Keypad
Entry Feedback