Circuit Biscuits
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Docs Build Test Play
Circuit Biscuits Dashboard Jar
Circuit Biscuits Workshop

Freeplay

Welcome to the Biscuit Jar: each module panel is a biscuit you can test, while utility panels help you organise, save, and review your lesson progress.

Biscuit Jar Guide

📖 Docs
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⋮⋮Move Panel
▶Set Mode / Run
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📖Open Notes

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Workspace Settings

LED

📖 2 DEV MCU

LED Matrix

Pixel Art Editor 8 x 32 manual bitmap
Brightness Auto
Animation Builder
8
Preview in Browser Preview the frames locally on browser.
Run on Device Read copies the device animation into the editor. Send uploads to device RAM and saves to flash. Play starts, Pause holds the current frame, and Stop ends playback.
No animation frames yet. Draw a bitmap, then add it as frame 1.
📖 4 DEV MAX

RGB Matrix

Selected #ff3366
RGB Animation Builder 8 x 8 colour frames
Preview in Browser Preview the frames locally on browser.
Run on Device Read copies the device animation into the editor. Send uploads to device RAM. Play starts, Pause holds the current frame, and Stop ends playback.
No RGB frames yet. Paint the panel, then add frame 1.
DEV RGB

Motion Sensor

Pitch
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Roll
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Yaw
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📖 6 DEV IMU

Sonar

Forward Distance —
Near Front of device Far
Range
—
📖 5 DEV SON

Clock

Time—

Text

Text—

Automation

Example Routines
Expression Help
Use plain expressions throughout automation. Quote string literals in actions.
Variablesdistance_cm, pitch, roll, yaw, mode_number, mode_name, error_code, time_hour, time_minute, time_second, time_hhmm, display_text, display_text_length, scroll_mode, animation_current_frame, animation_frame_count, animation_interval_ms, animation_playing, bluetooth_name, bluetooth_uart_baud, elapsed_ms
Helpersclamp, round, floor, ceil, abs, min, max, int
Condition expressions
abs(pitch)
                                    roll
                                    distance_cm / 10
                                    mode_name
                                    pitch > roll
Action expressions
DISPLAY_ANIMATION_FRAME {{ clamp(round(distance_cm / 10), 0, 7) }}
                                      P {pitch} R {roll}
                                      {mode_name}
                                      HELLO {bluetooth_name}
Distance —
Pitch —
Roll —
Yaw —
Mode —
Text —
Frame —
Automation Routine Add blocks, watch live values, then run or step through.
Run in Browser Edit, simulate, and save the full routine in the app.
No automation steps yet. Add an action, wait, condition, or while loop block.
Run On Device Upload the firmware-safe Action and Wait subset to the board and manage flash storage.
Device automation supports Action and Wait steps only. Upload sends the firmware-safe subset to the board.

Live Feed

Feed Text—
Feed StatusIdle
Pick a friendly RSS source, or use a CORS-friendly JSON endpoint. RSS feeds use latest_title; weather feeds use values like current.temperature_2m.

The Terminal

Reference

Click a command name to fill the Raw Command box. Bitmap rows use eight uppercase hexadecimal values, one per display row. Animation frame indexes start at 0.

📖 3 DEV USB DEV BT

Explore Related Tools And Guides

Use Biscuit Jar as the hub, then branch out to wiring diagrams, lessons, and play experiences that use the same board features.

Learn The Hardware
Docs Library Open pupil notes, technical deep dives, device notes, and course planning guides. Device Notes Read module-specific guidance while using the dashboard. Device Gallery See the devices and their related resources.
Build And Play
Breadboard Snapshots Open saved breadboard snapshots or import a wiring JSON. Play Turn ideas into rules and actions.