ProtoKit 5


Waterproof, Dustproof, Radio Transparent, Tamper Evident.

Upgraded Features

ProtoKit5 replaces the ProtoKit4. We had a lot of great feedback from customers of our earlier ProtoKit 4. Here are some of the improvements we made:

  • Larger IP67 enclosure: W x H x D | 130 x 175 x 45 mm | 5.12 x 3.24 x 1.77 inches
  • Two cable glands
  • All components soldered to board, ready to go.
  • Fully integrated tamper detect perimeter circuits - switch, pads, user defined.
  • Easier to wire, more robust connectors - screwless, spring cage & tension clamp.
  • Dedicated +5V connector
  • Schematics
  • How to wire

Whats Inside Your Kit

This kit comes assembled and ready to start building your prototype in to. The following components are included:

❶ IP67 enclosure, dustproof, waterproof enclosure with lid
❷ Integrated protoboard.
❸ Adapter for perimeter circuits
❹ GPIO connector extension
❺ Standoffs for Pi, M2.5 - x 3
❻ Screws for Pi, M2,5 Torx T8 - x 3
❼ Screws for protoboard fix - x5
❽ Cable glands, 3/4 - x2
❾ IP67 lid with neoprene gasket
❿ Screws for lid - x6
⓫ Tamper switch actuators - x2



The protoboard fits cleaning into the enclosure and can easily be removed for wiring and assembly with your components.

Slot for Pi Computer

Protokit will fit the following Pi footprint computers:

  • Raspberry Pi 2, 3, 3B+, Zero
  • Asus Tinkerboard
  • Odroid C2 (Heatsink may interfer if zymbit security module fitted)

IMPORTANT ! - The Pi computer is fitted connector down, with the CPU facing the protoboard.

Standoffs to Mount Pi Computer
Three M2.5, 5mm pcb standoffs are soldered to the board. Additional screw-in standoffs are supplied to achieve an overal standoff - between Pi and protoboard - of 18mm.

Slot for Zymbit Security Module - Zymkey 4i

Perimeter Adapter Interface

Perimeter Configuration Jumper

Tamper Switches - Circuit 1

Perimeter Pads - Circuit 2

Input / Output Connectors

+5V Power Input Connector

Power Bus - 3v3

Bus Bars - 2 X 15

Grid Arrays - 5 X 15
The grids are not powered and are designed to make it convient to solder wires and components into your design.
The reference markers make it easy to document your design and later transfer to work instructions or a PCB design net list. Each pad can be uniquely referenced as G15.D.9 for example.

Schematic of Protoboard
Download Schematic >


  • Wall and Pole mounting options. Learn More>


Fitting a Zymbit Security Module & Perimeter Adapter

If you are fitting a Zymbit security module, here’s where it goes. Fit the perimeter adapter at the same time.

Sequence for Fitting Zymkey4 and Perimeter Adapter

Configuring Perimeter Detect Circuits

Zymbit security modules contain two perimeter circuits that can be used to detect tampering of a secure envelope. Each tamper circuit is closed in normal operation. When a circuit is opened, a Tamper Event is registered by the Zymbit Security Module.

Learn how to configure and operate perimeter events in software >

Typically the two circuits are configured to provide independent layers of physical security:

  • PERIM 1 - protects an inner electronic enclosure, like this ProtoKit5 enclosure.
  • PERIM 2 - protects an outer cabinet enclosure, trip wire or other.

On ProtoKit 5 there are several ways to configure PERIM 1 and PERIM 2. By default both circuits are closed with two jumpers. 1A<>1B , 2A<>2B.


Using Tamper Switches

The protoboard includes two tamper switches, PERIM_SWA and PERIM_SWB, that are connected in series to the PERIM 1 tamper circuit. To configure and activate these switches follow these steps:

  • Remove the Jumper 1A<>1B
  • Pressing down both switches SWA, SWB will close the PERIM 1 circuit.
  • The lid of you ProtoKit 5 includes two “actuators” that align with the switches and activate (close) them when the lid is fitted and screwed securely in place. If needed you can adjust the length by screwing the actuator in or our of the panel.

Tamper Switch Actuators Fitted to Lid

Tamper Switch Actuators Pressing Switches

Using Perimeter Pads

The protoboard includes four tamper pads that are connected to the PERIM 2 tamper circuit as follows:

Connected on protoboard PCB (orange color)

Connected by user circuit (green color)

Examples for Using Perimeter Pads
The Perimeter Pads are designed to be used in applications where the lid contains a user defined circuit such as a display or keypad, or this custom shield (which was designed for ProtoKit4). Springed Pogo pins can be used to connect the lid to the perimeter pads. This provides an additional layer of physical security to the tamper-switches.

Add Your Pi Computer

Fit the GPIO extender header.

Fit your Pi computer being careful to correctly align pins. Secure in place with three M2.5 screws using a T8 TORX driver.

5- Place into Enclosure

Fitting Cable Glands

Your kit comes with two nylon cable glands pre-fitted into ½" 14 NPT threaded holes. They accept cables with diameter 0.51" to 0.71".


Need something different?
There a many different types of cable glands: size, cable clamp, strain relief, number of cables, material, etc. If you need something different to what is supplied with you kit, then check out this supplier who has a great selection. ElecDirect >

6- Add Wires that Connect Externally

7- Add Enclosure Lid

Be sure to add the black seal that was provided with your kit.

IP67 Enclosure Ratings

The enclosure is rated for the following ingress protection.

IP6x Solid particle protection

  • Dust Tight - complete protection against contact (dust tight). A vacuum must be applied. Test duration of up to 8 hours based on air flow.

IPx7 Liquid ingress protection

  • Immersion, up to 1 m depth. Ingress of water in harmful quantity shall not be possible when the enclosure is immersed in water under defined conditions of pressure and time (up to 1 m of submersion).

For further details on IP ratings refer to wiki/IP_Code.


Panel Mounting
This enclosure can be mounted directly to a wall or flat surface using two self tapping screws.

Pole Mounting
This enclosure can be easily mounted to a pole using a pole mounting brackets available from the Zymbit store.

@Tgratier Check out the new ProtoKit 5. We have listened to feedback from you and other customers and made ProtoKit5 easier to integrate and more secure than ProtoKit4. (Documentation still in draft form)

Let us know what you think about it !

Does this power both the pi and the zybit module? What amperage should it be? 2amp?

Yes the +5V connector powers the Pi, via the GPIO header pins 2 & 4, also the Zymkey.

The recommended power for the Pi is 5V, 2.5A. The zymbit 4i takes neglible current (only a few millamps). If you add other power hungry devices (eg a modem) you may need additional current too. (The connector is rated at 8A).

Is it possible to use with protokit 5? If not, what LTE GSM modules can I use with pi 3B+ and the protokit? Best regards


After a brief review of your selected modem, we believe it will be possible to use it with ProtoKit 5, but cannot guarantee it 100%.

You will need to make the following configurations:

  • GPIO4 - will need to be remapped to another GPIO(5) - instructions here >
  • I2C - addresses will need to be configured to NOT conflict - instructions here >
  • Mechanically, we suggest you fit the modem to the underside of the protoboard - images to follow >

Thank you for your answer. I’m waiting for the picture. As it seems there is no space inside the protokit box to fit in both the pi and the gsm hat. Do you have any hardware suggestion, which module can easily fit inside the box and support fast gsm like lte?
Best regards Matthias


  1. The modem you have selected can be fitted like this - but it will probably conflict mechanically with the Zymkey (if you are using it), so you might need to cut out the zymkey header.

  1. Alternatively a more flexible solution would be to use a USB stick LTE modem, like this one. There are many options available - so pick whats good for your country.

If you use a short USB extender cable you can then fix the USB stick where you want in the protokit box:




You might find this new topic helpful - both these customers used USB type modems…