This document describes the orb expansion port, and how to build an external device which attaches to the orb.
| Pin 1 | Vunreg - 11 volts DC from power transformer |
| Pin2 | MCLR - used to reset device for programming. Leave unconnected |
| Pin 3 | PGD - used for programming. Leave unconnected |
| Pin 4 | PGC - used for programming. Leave unconnected |
| Pin 5 | RS-232 RX (TTL level signal) |
| Pin 6 | RS-232 TX (TTL level signal) |
| Pin 7 | Ground |
The serial port connects to the orb with the following fixed parameters:
Note the RS-232 operates at TTL levels (+5 volts / ground). For connection with a PC or standard serial port, one must us an appropriate line level converter such as the MAX233 available from Maxim.
Ambient produces and sells a serial developer board for this purpose. It can be purchased from Ambient. Or keep reading to make your own.
Click here for the schematics in PDF format.
| Description | Manufacturer | Manufacturer Part Number | Digikey Part Number |
| 7-pin male connector (SMT) | Hirose | DF13-7P-1.25H(20) | H2224-ND |
| 7-pin housing | Hirose | DF13-7S-1.25C | H2184-ND |
| Crimp terminal for housing | Hirose | A3B-2630SCC | H9999-ND |
| Crimping Tool | Hirose | A3B-TA2630HC | H9998-ND |
| Pre-crimped assembly | DigiKey | (value add part) | H4BBG-10112-W8-ND |
Because the crimp tool sells $958.00, it is recommended to use pre-crimped
assemblies from Digikey, part number:
H4BBG-10112-W8-ND. By swapping the 'W' for other letters, you can order in
different colors. See Digikey website
for details.
Note a variety of colors are available.