Locks, doesn't loosen
Molex Micro-Fit connectors latch positively and resist vibration. No more re-torquing terminals after every test run.
connector-boards --for "Arduino® Opta™"
Get your robot to market fast — without sacrificing wiring reliability.
WireTight boards seat directly onto the Opta's screw terminals and give you a clean, locking connector instead. Wire your harness once, plug it in, and stop chasing loose strands, backed-out screws and miswired inputs.
Screw terminals are fine on the bench. Not on a robot.
The Opta is a great controller to build on. But its screw terminals are where field problems start: vibration, rework and hand-wired panels add up to intermittent faults that are hard to find and expensive to fix after you ship.
Swap a controller in seconds
Unplug two connectors, pull the Opta off the DIN rail, drop in a new one. Service calls go from an hour of rewiring to a minute.
Wire it right, every time
Polarized, keyed connectors mean your harness only goes in one way. Build harnesses on the bench, test them, and ship with confidence.
Faster builds
Stop stripping, ferruling and landing 20 individual wires per controller. Your assembly step becomes "plug in."
No redesign required
Keep the Opta and your existing program. WireTight is a drop-on interface, not a new controller.
Prototype to production
Start with the bare-hole boards and your own connector, then move to Micro-Fit when your design settles.
| Hand-wired screw terminals | WireTight board | |
|---|---|---|
| Wires landed per Opta | 20 individual wires | 2 connectors |
| Controller swap time | Rewire every terminal | Unplug, swap, plug in |
| Vibration resistance | Screws can back out | Positive-latch connector |
| Miswire risk | Any wire in any terminal | Keyed, one-way mating |
| Harness testing | After install | On the bench, before install |
One kit per module. Three ways to buy.
Every kit covers all of a module's terminal rows. Pick bare boards for your own connectors, boards with Molex Micro-Fit installed, or the full kit with standoffs and, for expansion modules, the power jumper.
Bring your own connector
Every terminal comes out to a row of plated holes on a 2.54 mm (0.1″) pitch. Solder in any 0.1″ header, terminal block or IDC connector, or wire directly.
Molex Micro-Fit 3.0
Polarized, latching right-angle headers, installed. Mate them with standard Micro-Fit receptacle harnesses. Relay outputs are rated 5 A DC per channel.
Pull-up / pull-down pads
The Opta's digital inputs have no internal pull resistors. Each input has a pair of through-holes for a standard axial resistor, pulled to +V or GND, so open-collector and dry-contact sensors read cleanly.
Standoffs and power jumper
Stacked boards bolt together through their corner holes with M3 standoffs. Expansion kits add a Micro-Fit power jumper that carries the supply over from the board next door.
Shop
Select the Arduino module you have. The SKU (AFX…) is printed on its label.
Accessories
Building more than 25 units? Ask about volume pricing and pre-built harnesses.
Specifications
| Set | Fits | Boards | Micro-Fit headers | Stacking |
|---|---|---|---|---|
| B001 | Opta RS485 / WiFi / Lite | T1 + + − −, I1–I8 · T2 relays 1–4 (5 A DC) | 2× 2×1 power, 2×4, 1×8 | none |
| B002 | Opta Ext D1608E / D1608S | T1 + + − −, relays 1–2 · T2 I1–I10 · T3 I11–I16 · T4 relays 3–8 | 2× 2×1 power, 2×2, 2×5, 2×3, 1×12 | T2 on T1, T3 on T4 |
| B003 | Opta Ext A0602 | T1 + + − −, analog 1–2 · T2 PWM 1–4 · T3 analog 3–6, outputs 1–2 | 2× 2×1 power, 2×3, 2×3, 2×6 | T2 on T3 |
All boards: plated 2.54 mm hole rows on every board (bare kits ship without connectors). Relay outputs are DC only, 5 A per channel. Full pinouts on each set's page.
Install in three steps
- Seat the board on the Opta's terminal row.
- Tighten the terminals once to clamp the board's pins.
- Plug in your harness. From now on, that's the only step.
FAQ
Do I need to change my Opta program?
No. WireTight boards are passive — they only change how wires connect to the terminals.
Can I switch AC loads with the relay board?
Not at this time. The relay board is rated for DC loads up to 5 A per channel, 30 V max.
Which connector should I pick?
Choose Micro-Fit if you want a ready-to-use, latching connector. Choose the bare kit if you already standardize on a different connector: the holes are on a 2.54 mm (0.1″) pitch, so any 0.1″ header or terminal block fits, or you can wire directly.
Do the inputs need pull-up or pull-down resistors?
The Opta's digital inputs have none built in. Open-collector (NPN) sensors and dry contacts need one. Every digital input on our boards has a pair of through-holes for a standard axial resistor, pulled to +V or GND.
How do I power an expansion module?
Each set's T1 board has two identical 2-pin power headers. Feed the supply into one, then run a power jumper from the other to the next module's T1. Expansion full kits include one jumper.
Do you sell mating harnesses?
Pre-built Micro-Fit harnesses are on the way. Get in touch if you need them now.
Built for machines that move.
Mobile robots, cobots and test rigs shake loose what a bench prototype never would. Lock your controller wiring down before it ships.
Building something with the Opta?
Tell us about your project. We're happy to talk volume, custom pinouts or harnesses.
sales@wiretight.com