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==Construction== ===Electronics=== The controller is based on a [[Teensy|Teensy 2.0]] AVR microcontroller board in the right half, with an I/O expander in the left half. The halves are connected with a 4-lead cable with power and [[I²C]] lines to the I/O expander. A mini-[[USB]] port is supposed to be soldered on the right PCB and the Teensy board connected to the PCB with both pins and an internal mini-USB cable with cables soldered to the mainboard. Alternatively, a mini-USB cable can be connected directly to the Teensy board if there is a wire between the Teensy's "VCC" pin and "5V" on the main board, or the I/O expander gets its power from elsewhere. The PCB design is reversible: the same type of PCB is used for both the left and right side. This means that it is possible to reverse the positions of the Teensy and the I/O expander, but then they would have to be mounted upside-down. Jumpers on the top of the PCB are also used. The [[Cherry MX]] switches can be PCB-mounted, or be plate-mounted if a mounting plate is used (which they are in the official case designs). There is a diode for each switch, that can be either surface-mounted, through-hole, or through-hole, mounted inside most switches. The diodes are supposed to be facing the other way on the left keyboard half, but the direction could also be swapped in the official firmware by flipping the values of <code>DRIVE_ROWS</code> and <code>DRIVE_COLUMNS</code> in <code>options.h</code>. See the [http://link.massdrop.com/51052a5521e070dffadc35145216439e7332c1f9330000f5/UR13ByuoATIlk-ogBaa1c discussion on the Ergodox assembly page]. Component list below (adapted from [https://ergodox.input.club/Hardware.html ErgoDox.org]): {| class="wikitable" |- |2 |ErgoDox PCB |- |1 |[[Teensy]] USB Board, Version 2.0 |- |1 |MCP23018-E/SP I/O expander |- |76-80 |[[Cherry MX]] switches, PCB or plate-mounted |- |76-80 |1N4148 diodes, SOD-123 package or DO-35 (0.3" pitch) |- |2 |2.2 kΩ resistors (red, red, red) |- |3 |3mm T1 LEDs |- |3 |~220 Ω resistors, or match to LED. (red, red, brown) |- |5 |Short jumpers |- |1 |0.1 µF ceramic capacitor (marked "104" for 10*10<sup>4</sup> picofarad). Not strictly necessary |- |1 |USB mini B connector WM17115.¹ |- |1 |USB mini B plug with short cable (such as H2955).¹ |- |1 |USB cable male A to male mini B.¹ |- |2 |3.5 mm [[TRRS]] sockets, CP-43514. FC68129 will also work if its extra pins are snipped off.² |- |1 |Cable with two 3.5 mm [[TRRS]] plugs.² |- |} Notes: 1. The USB cable could also be routed directly to the Teensy 2.0. On early revisions of the PCB (Massdrop), an additional wire would also have to be connected from Teensy pin VCC to the pad marked "5V" near the plug's position. The latest revision of the PCB would not require an additional wire. 2. FC68129 has been confirmed to work. A fixed cable could also be used instead of TRRS cable and plugs. Builders have also used other types of connectors. ===Backlit version=== Work has been going to make an official backlit version of the ErgoDOX. The backlit PCB uses a single "high power" SMD mounted RGB LED on each half connected to high efficiency LED drivers controlled by PWM and [[I²C]] bus. On top of the LED there is a light pipe which directs the light into .75mm fiber optic strands, these are then individually routed on the back of the PCB to each switch where they are fixed using the standard LED hole in the PCB/Switch. This gives the ability for the back-light on each half to be dynamically set to any RGB value. The development is hosted on [https://github.com/jalli/ErgoDox GitHub]. The new back-light enabled PCB fixes the outermost key columns bug and is fully backwards compatible, it will function as the original when the back-light components are absent. The following table lists the additional components required for the back light: {| class="wikitable" |- |2 |LM3549 Sequential RGB LED drivers |- |2 |LPF-R011362S 90° Light tube, square end. |- |2 |LRTB C9TP RGB LEDs 30-250mA per color |- |76-80 |0.75mm Fiber Optic cables, 200mm(8") |- |2 |C1206C106J8RACTU 1206 Footprint 10 µF Capacitor ,6.3V/10V (X7R/X8R) |- |2 |C1206C475J8NACTU 1206 Footprint 4.7 µF Capcitor ,6.3V/10V (X7R/X8R) |- |2 |L1210R2R2MDWIT 1210 Footprint 2.2 µH Inductor, 1900/2000 mA |- |} Total additional cost is expected to be between 15-20 dollars for both halves depending on volume. Existing cases can be modified for the backlit PCB by removing material to make room for the light tube. ===Case=== '''Dox''''s original case was 3D-printed. In '''litster''''s case design, the case is built from layers of acrylic (or aluminium) bolted together. The switch mounting plate layer is thicker than the usual 1.5 mm, making the switches friction-fit rather than snapped on. With a litster case, the dimensions (at the widest point) are 21.6cm (8.5in) x 20.3cm (8in) x 1.8cm (0.7in). [[FalbaTech]] has sold cases of machined PVC, wood or bamboo, with or without wrist rests in various designs. ===Keycaps===
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