The Grissom is a WiFi controlled flight computer with an advanced but simple to use interface.
You can run this with a single battery, or with dual batteries to use a separate one to power your outputs.
The Grissom is supplied either soldered, or with a four components to solder on as a semi-kit. No battery connectors are included as most users will want to solder leads directly on to the device.
It provides ample features for the most advanced use-cases, whilst supporting simple setup and use through a clean and modern web-based interface.
Configure, arm, disarm and view flight log all online without any custom apps, hardware or cables.
Connect via your phone's WiFi hotspot to benefit from additional features such as free cloud backup of configurations and flight logs and geolocation.
The extremely detailed flight log viewer shows the most detailed breakdown of flight events of any computer on the market, making debug and diagnostics very easy.
Features
- 2x 10A current-limited output channels
- The PCB is 1.6mm thick FR-4 and measures 26.3mm x 52.7mm
- The mounting holes are 3mm diameter and cross corners of 19.5mm x 46.5mm
- With the 4 parts soldered on the unit weighs approx 11g.
- 2.54mm pitch battery holes. Takes two batteries (or one by soldering the link jumper). One for the board and one for your output channels.
- Integrated beeper
- 1-wire 800kHz digital LED output
- Ground test output channels
- Digital Barometer with 0.5m accuracy upto 30,000ft/9100m
- Wake-on-touch low-power functionality
- Over-the-air firmware updates
- 9+ hours of flight data storage, with continuous flight data recorded every 50ms
- Free, automatic cloud backup for flight logs and configurations
- Advanced but simple to use rules engine for configuring flights
- Stores multiple, separate flight configurations for different rockets/setups
- Extremely detailed flight log visualisation
- UART port for debug
- Bluetooth and wired connectivity to Shepard for streaming real-time flight data and output events to Goddard on the ground
- Separate deployment and electronics battery terminals + solder jumper for single battery mode
» You can visit the instructions / manual page here.
This includes a guide on how to assemble, operate and configure your device.
Processor
First, you should attach the processor. Position it so that all the castellations neatly line up with the receiving pads. Hold the processor in place with some tape. Using a fine tipped soldering iron and fine flux-cored solder, work your way around the castellations, flowing solder into the joint.
The Red pins are attached to the ground plane and will require much more heat from your iron to get them up to soldering temperature, we recommend you do these pins last.
We recommend starting with the Blue pin, followed by the Yellow pin. If you do not alternate the sides initially, soldering all along one side can cause the processor to lift up, creating a gap on the opposite side.
Use a mignifying eyepiece to fully inspect each solder joint and ensure all are properly and cleanly connected with no bridged pins.
It is not necessary to solder the ground pad (Green) underneath the processor, but a small blob of thermal conductive paste won't hurt.
Processor positioning
System test
Before you attach the next components you should power up the board and navigate to the system-test page (under Menu -> Device info -> System test) and ensure you are getting a reading from the altimeter. If it is reading 0m constantly then there is a problem with your board. Check the soldering joints on the processor. If the problem remains please contact your vendor for assistance.
Rectifier
The orientation for the rectifier should be obvious. Ensure you properly solder the tab and both legs properly.
Rectifier positioning
Through-hole components
Attach the buzzer (blue cricle), getting the correct orientation (note the + marked on the board and component).
Attach the FET (red rectangle). Note that the metal tab on the back of the component faces outwards (to the right on the picture), away from the power terminals.
Attach the output/touch connector block (green rectangle), ensure it is properly seated before soldering all pins.
Through-hole component positioning
System test
Power up the board and navigate to the system-test page (under menu -> Device info -> System test) and ensure you are still getting a reading from the altimeter. If it is reading 0m constantly then there is a problem with your board. Check the soldering joints on the processor. If the problem remains please contact your vendor for assistance.
Perform a system-test with indicator loads (we recommend mini 9V filament bulbs) on the output channels and ensure they all fire properly.
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