I sourced most of the parts from DigiKey. The VersaTermBOM.csv file in this folder includes all the parts and their part numbers.
You can also click the link below to automatically create a shopping cart at DigiKey that contains most of the parts:
https://www.digikey.com/short/d0qw14h1
The the following necessary parts are currently not available at DigiKey and have to be ordered separately:
- Raspberry Pi Pico: not sold at DigiKey, available at AdaFruit, SparkFun, Ebay and others
- 2N7000 MOSFET (need 7): currently (May 2022) on backorder at DigiKey. Available on EBay from various sellers.
If you want to use the provided 3d-printable enclosure, you will need four machine screws #4-40 with length 22mm (7/8") below the head and matching #4-40 nuts. DigiKey part #335-1089-ND and #36-9600-ND will fit.
The vast majority of solder points are through-hole and easy to solder, except for the following:
- Diodes D1 and D2 are surface-mount devices but the diodes themselves are fairly large. I have no SMD soldering experience and had no problem soldering them.
- The Raspberry Pi Pico does not route the USB data signals to its pin headers. However, there are two test points (TP2 and TP3) on the bottom of the Pi Pico on which the USB data signals can be accessed. Solder in a short wire from TP2 on the Pi Pico board to TP2 on the VersaTerm PCB. Same for TP3.
- While the HDMI connector is through-hole, its pins are very closely spaced. I definitely recommend using a multimeter to check there are no solder bridges between the pins after soldering.
Other tips:
- For the Raspberry Pi Pico, solder female header pins onto the PCB and then male header pins to the Pi Pico. That will make it easier to debug issues later or to replace the Pico if that becomes necessary.
- I also used male/female headers to connect the Max3232
- When soldering the male Molex connector for the TTL serial connection to the board, do not stick it into the board as far as it will go, otherwise the female connector will not fit afterwards. I recommend soldering the male connector while plugged into the female one, that way there is definitely enough space.
For supplier and manufacturer part numbers, see VersaTermBOM.csv
| Designator | Component |
|---|---|
| R21,R24 | Resistor 100 Ohm |
| R1,R2,R3,R4,R5,R6,R7,R8 | Resistor 270 Ohm |
| R14 | Resistor 390 Ohm |
| R17,R20,R25,R26 | Resistor 470 Ohm |
| R13,R16,R19,R27,R28,R29,R30 | Resistor 1k |
| R15,R18 | Resistor 2k2 |
| R22 | Resistor 4.7k |
| R9,R10,R11,R12,R23 | Resistor 10k Ohm |
| D1,D2 | Diode SMT Schottky |
| D3,D4,D5,D6,D7 | Diode Axial 1N4148 |
| Q1,Q2,Q3,Q4,Q5,Q6,Q7 | MOSFET 2N7000 |
| C1,C2 | Capacitor 10uF |
| 3.3V / 5V | Switch |
| RESET,DEFAULTS | Button |
| REG1 | Recom 5V Regulator |
| SG1 | Buzzer |
| Power | Barrel Connector |
| Power | USB-B Mini Connector |
| VGA | DB15 Connector |
| PS/2 | PS/2 Connector |
| HDMI | HDMI Connector |
| USB | USB-A Connector |
| RS232 | DB9 Connector |
| TTL Serial | Molex Connector Male |
| U1 | Raspberry Pi Pico |
| U3 | MAX3232 board |
