Sorry, these are completely sold out, and will not be manufactured in the future.
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Dontronics Home Page  DT101 18 Pin PICmicro Simmstick.
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DT101 Blank Printed Circuit Board Price: ($8AUD)
Includes World Wide Postage. (For a total minimum purchase bare board value of $20AUD)

Click on the Icons for Schematics in PDF or GIF format.
A DT101 PDF data sheet can be downloaded from

The DT111 Simmstick is a big brother for the DT101 and is simply a DT101 Simmstick with an extra 1" of prototype area that makes it into a 2" SimmStick. The Schematic and overlay are the same except for this additional 1 inch of prototype area. It appears users are interested in a board such as this, so we produced it. Pricing is the same as all other 2" Simmsticks.

Users who want to access an EEPROM on the DT101 PCB's using the MEL complier need to edit the PIC.PBL file to reverse the Pin allocation for the I2C function (SDA & SDL). from Wolf Maier SCORPIA DESIGN 4-Sep-98

Board Components:

1 by DT101 PCB

1 by 780L5 +5 Voltage regulator in TO-92 case. (Optional)

1 by Capacitor C1 .01uf (or .1uf) Ceramic

1 by Capacitor C2 .01uf (or .1uf) Ceramic

1 by Capacitor C3 15pf to 22pf Ceramic (Install only if Crystal is installed)

1 by Capacitor C4 15pf to 22pf Ceramic (Install only if Crystal is installed)

1 by Resistor  R1 10K .25 watt

1 by Resistor  R2 10K .25 watt

1 by Resistor  R3 10K .25 watt

1 by Resistor  R4 10K .25 watt   (Install only if EEPROM is installed)

1 by Resistor  R5 10K .25 watt   (Install only if EEPROM is installed)
And either a Crystal of a suitable value, or a 3 pin Resonator. If a crystal is fitted then C3 and C4 must be installed. If you use a Resonator, then you musn't install these two caps.

The most common crystal used for beginners is 4Mhz, as this matches in with the PIC16C84/04/P that most people start with.

Serial Communications:

1 by Capacitor C5 1uf Electrolytic (PCB mount.) or Tant. @16 V.

1 by Capacitor C6 1uf Electrolytic (PCB mount.) or Tant. @16 V.

1 by Capacitor C7 1uf Electrolytic (PCB mount.) or Tant. @16 V.

1 by Capacitor C8 1uf Electrolytic (PCB mount.) or Tant. @16 V.

1 by MAX-232 E3 (or equivalent)
It may also pay to install a 16 pin socket for the Max-232, as you may have to remove it for some configurations.


Used to Isolate the +5V signal on the edge connector from the 78L05 regulator output if it is installed. Both outputs should never be used together. The track on the solder side of the board under J1 needs to be cut to isolate the 78L05 regulator output. A test link and two male posts are used to reinstall the regulator output.

Brings in an alternative source of DC power. A 9 Volt battery may be connected to J2. Pin 1 is positive and pin 2 negative.

You may connect your A/D chip signals here. Care must be taken to make sure there are no hardware conflicts. Sure you can use the same pinout as the PicStic, but this would mean your Max-232 Comms, and EEPROM may need to be re-mapped.

The Real Time Clock control lines can be connected to here. As above, make sure you don't conflict with other signals used.

Analog to Digital input lines.

Used for Dallas DS-1302 to get power from a standby battery to it's VCC2.

Connection points for 3V Coin Type watch or hearing aid battery.

Real Time Clock:
The Panasonic NJU-6355 requires a crystal with a load capacitance of 12pf.
The Dallas units need a 6pf crystal. I have both of these 32.768khz crystals in stock.
Sample code can be found at

Analog to Digital:
Most common A/D chips will fit this 8 pin DIP layout. Although the original PicStic used an LTC1298, a simple National ADC0831 will fit the same socket.

Sample code for both the NJU-6355 RTC and LTC-1298 A/D can be found at Micromint's PicStic(tm) site at This has Circuits, Overlays, Code, Data Sheets for the 1, 2, and 3 PicStic. Beware, they keep changing this site to different URL's.

Brown-Out Circuit:
This small IC in a TO-92 package is used to stop the Micro operation becoming unpredictable during a power 'brown-out'. In most cases this isn't required. It's just an added precaution for reliable operation. The older PIC16C5x may well need this device.

By just simply ignoring the brown-out circuit and installing resistors R1 and R2, the circuit operation should be fine.
R1, R2, and R3 must be installed at all times for normal operation. Yes, even if you don't use a brown-out circuit.

If you wish to use the brown-out circuit, it's just added to the board, and can be either a CMOS or Open Collector type.
You can use the following I.C.'s:
Panasonic MN13811-S (Open Collector)
Panasonic MN1381-S (CMOS)
Zetek ZM33064
Motorola MC33064P
Other types may also be suitable. These should switch at between 4.2 and 4.6Volts. This is for +5 Volt operation.
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