IR-to-RS232 Converter Communication Module
Description
The IR-to-RS232 converter communication module allows a Pushpin to act as
a go-between for a desktop PC and the remaining ensemble of Pushpins. It
is tethered to both a 9VDC power supply and a standard RS232 serial cable,
as well as equipped with a single IR transceiver identical to those found
on the four-way IR module.
Schematic Diagram
[PDF]
[Protel]
Printed Circuit Board Layout
[PDF]
[Protel]
Parts List for 1 Piece
| Vendor | Vendor Part # | Qty. | $/Unit | Description |
| Newark | 32C5876 | 1 | $3.12 | Analog Devices ADG733 CMOS low voltage triple SPDT switch in a TSSOP form factor used to switch between IR and RS232 modes. |
| Newark | 83F8851 | 1 | $??? | IrDA transceiver. |
| Digikey | H2258-ND | 1 | $??? | 9-pin 1mm pitch header for connecting with the processing module. |
| Digikey | P???GCT-ND | 1 | $??? | q0603 ???Ohm resistor used to determine intensity, and hence range, of IR transmission. Recommended range is 100-1000 Ohms. |
| Digikey | PCC???CT-ND | 1 | $??? | ???pF ceramic capacitor for determining the baud rate at which this module is able to receive an infrared stream. Specifically, the duration of a single infrared pulse should be 10kOhm * CpF, where C is the value of this capacitor as measured in pico Farads. |
| Digikey | 311-0.0GCT-ND | 4 | $??? | 0Ohm jumper. |
| Digikey | P10KGCT-ND | ??? | $??? | 0603 10kOhm resistor. |
| Digikey | MM74HC221AM | 1 | $??? | Monostable multivibrator for properly conditioning the signal generated by the infrared receiver. Guarantees a uniform pulse width for signals that would otherwise be too short. |
| Digikey | 296-1095-1-ND | 1 | $??? | Single inverter reverses signal polarity of the processing module's UART transmit line for compatibility with the infrared transmitter. |
| Digikey | CP-002A-ND | 1 | $??? | CUI Inc. CP002A 2.1mm DC power jack to be used with a 9V wall wart. |
| Digikey | LT1121CN8-3.3-ND | 1 | $??? | Linear Technology LT1121CN8-3.3 voltage regulator for converting 9VDC to 3.3VDC. |
| Digikey | MAX233CPP-ND | 1 | $??? | Maxim-IC MAX233CPP dual RS232 level converter in a DIP package. |
| Digikey | A2100-ND | 1 | $??? | Amplimite 745781-4 DB9 connector connects to the PC serial cable. |
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