{"public_id":"JmZKyqIL5G1N","title":"Control a continuous servo","published":true,"lock_version":0,"url":"/assemblies/JmZKyqIL5G1N","edit_url":"/assemblies/JmZKyqIL5G1N/edit","updated_at":"2026-09-24T16:49:43.303+10:00","document":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0},{"id":"computer","locked":true,"moduleId":"LBKit-laptop","position":[-420,0,-52.4],"rotation":0,"animation":{"in":1.2,"out":1,"inDelay":0,"outDelay":0}},{"id":"usb-cable","moduleId":"LBKit-usb-ab","position":[-206,0,25.6],"rotation":0,"animation":{"in":1.8,"out":1,"inDelay":1.4,"outDelay":0}}],"steps":[{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0}],"wires":[],"labels":[{"id":"callout-0","pin":null,"part":"uno","text":"Uno R3"},{"id":"callout-1","pin":null,"part":"breadboard","text":"830-contact breadboard"}]},"title":"Set up the workbench","easing":"ease-in-out","caption":"Place the Uno beside the full-size 830-contact breadboard. Leave USB and any servo supply disconnected while wiring.","duration":17.2,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b","animation":{"in":1.5,"out":1,"inDelay":0.5,"outDelay":0}}],"labels":[{"id":"callout-0","pin":"connector88","part":"uno","text":"GND"},{"id":"callout-1","pin":"pinrailTopMinus_5","part":"breadboard","text":"Upper − · 5"}]},"title":"Prepare the rails","easing":"ease-in-out","caption":"Connect Uno GND to the upper − rail using a male-to-male jumper. Servo power will use its own lower rail.","duration":14.752,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"}],"labels":[{"id":"callout-0","pin":null,"part":"servo","text":"Continuous rotation · speed, not angle"},{"id":"callout-1","pin":"connector0","part":"servo","text":"Ground"},{"id":"callout-2","pin":"connector1","part":"servo","text":"Power"},{"id":"callout-3","pin":"connector2","part":"servo","text":"Signal"}]},"title":"Add the continuous servo","easing":"ease-in-out","caption":"Use male-to-male jumpers in the servo’s female cable connector. Check its lead colours: brown/black is ground, red is supply, orange/yellow is signal.","duration":15.112,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"},{"id":"uno-wire-2","to":{"pin":"pinrailBotMinus_42","part":"breadboard"},"from":{"pin":"connector0","part":"servo"},"color":"#24272b","animation":{"in":1.5,"out":1,"inDelay":0.5,"outDelay":0}},{"id":"uno-wire-3","to":{"pin":"pinrailBotPlus_41","part":"breadboard"},"from":{"pin":"connector1","part":"servo"},"color":"#d93432","animation":{"in":1.5,"out":1,"inDelay":3.0,"outDelay":0}}],"labels":[{"id":"callout-0","pin":"connector0","part":"servo","text":"Ground"},{"id":"callout-1","pin":"pinrailBotMinus_42","part":"breadboard","text":"Lower − · 42"},{"id":"callout-2","pin":"connector1","part":"servo","text":"Power"},{"id":"callout-3","pin":"pinrailBotPlus_41","part":"breadboard","text":"Lower + · 41"}]},"title":"Connect the servo cable","easing":"ease-in-out","caption":"Ground → lower − rail; supply → lower + rail. Use male-to-male jumpers in the servo’s female connector.","duration":16.6,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"},{"id":"uno-wire-2","to":{"pin":"pinrailBotMinus_42","part":"breadboard"},"from":{"pin":"connector0","part":"servo"},"color":"#24272b"},{"id":"uno-wire-3","to":{"pin":"pinrailBotPlus_41","part":"breadboard"},"from":{"pin":"connector1","part":"servo"},"color":"#d93432"},{"id":"uno-wire-4","to":{"pin":"pinrailBotMinus_38","part":"breadboard"},"from":{"pin":"pinrailTopMinus_38","part":"breadboard"},"color":"#24272b","animation":{"in":1.5,"out":1,"inDelay":0.5,"outDelay":0}}],"labels":[{"id":"callout-0","pin":"pinrailTopMinus_38","part":"breadboard","text":"Common ground · upper − 38"},{"id":"callout-1","pin":"pinrailBotMinus_38","part":"breadboard","text":"Common ground · lower − 38"},{"id":"callout-2","pin":"pinrailBotPlus_49","part":"breadboard","text":"External 5V · lower + 49"},{"id":"callout-3","pin":"pinrailBotMinus_49","part":"breadboard","text":"External ground · lower − 49"}]},"title":"Prepare separate servo power","easing":"ease-in-out","caption":"Join both − rails. Connect a suitable regulated 5V servo supply at the labelled lower rails; it is an additional requirement. Keep its + rail separate from Uno 5V.","duration":17.608,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"},{"id":"uno-wire-2","to":{"pin":"pinrailBotMinus_42","part":"breadboard"},"from":{"pin":"connector0","part":"servo"},"color":"#24272b"},{"id":"uno-wire-3","to":{"pin":"pinrailBotPlus_41","part":"breadboard"},"from":{"pin":"connector1","part":"servo"},"color":"#d93432"},{"id":"uno-wire-4","to":{"pin":"pinrailBotMinus_38","part":"breadboard"},"from":{"pin":"pinrailTopMinus_38","part":"breadboard"},"color":"#24272b"},{"id":"uno-wire-5","to":{"pin":"connector2","part":"servo"},"from":{"pin":"connector52","part":"uno"},"color":"#ed8831","animation":{"in":1.5,"out":1,"inDelay":0.5,"outDelay":0}}],"labels":[{"id":"callout-0","pin":"connector52","part":"uno","text":"D9 · servo signal"},{"id":"callout-1","pin":"connector2","part":"servo","text":"Signal · 1500 µs nominal neutral"}]},"title":"Connect the control signal","easing":"ease-in-out","caption":"D9 → servo signal using a male-to-male jumper. The pulse sets speed and direction. Approximately 1500 µs stops the servo; calibrate the neutral setting for your unit.","duration":19.6,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0},{"id":"computer","locked":true,"moduleId":"LBKit-laptop","position":[-420,0,-52.4],"rotation":0,"animation":{"in":1.2,"out":1,"inDelay":0,"outDelay":0}},{"id":"usb-cable","moduleId":"LBKit-usb-ab","position":[-206,0,25.6],"rotation":0,"animation":{"in":1.8,"out":1,"inDelay":1.4,"outDelay":0}}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"},{"id":"uno-wire-2","to":{"pin":"pinrailBotMinus_42","part":"breadboard"},"from":{"pin":"connector0","part":"servo"},"color":"#24272b"},{"id":"uno-wire-3","to":{"pin":"pinrailBotPlus_41","part":"breadboard"},"from":{"pin":"connector1","part":"servo"},"color":"#d93432"},{"id":"uno-wire-4","to":{"pin":"pinrailBotMinus_38","part":"breadboard"},"from":{"pin":"pinrailTopMinus_38","part":"breadboard"},"color":"#24272b"},{"id":"uno-wire-5","to":{"pin":"connector2","part":"servo"},"from":{"pin":"connector52","part":"uno"},"color":"#ed8831"}],"labels":[{"id":"callout-0","pin":null,"part":"uno","text":"USB-B · Uno"},{"id":"callout-1","pin":null,"part":"computer","text":"USB-A · computer"}]},"title":"Connect USB and upload","easing":"ease-in-out","caption":"USB-B → Uno; USB-A → computer. Leave the servo supply off while uploading, then connect it after checking the unloaded servo.","duration":16.72,"generated":true},{"state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0},{"id":"servo","moduleId":"LBKit-servo-continuous","position":[29,0,42],"rotation":0},{"id":"computer","locked":true,"moduleId":"LBKit-laptop","position":[-420,0,-52.4],"rotation":0,"animation":{"in":1.2,"out":1,"inDelay":0,"outDelay":0}},{"id":"usb-cable","moduleId":"LBKit-usb-ab","position":[-206,0,25.6],"rotation":0,"animation":{"in":1.8,"out":1,"inDelay":1.4,"outDelay":0}}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b"},{"id":"uno-wire-2","to":{"pin":"pinrailBotMinus_42","part":"breadboard"},"from":{"pin":"connector0","part":"servo"},"color":"#24272b"},{"id":"uno-wire-3","to":{"pin":"pinrailBotPlus_41","part":"breadboard"},"from":{"pin":"connector1","part":"servo"},"color":"#d93432"},{"id":"uno-wire-4","to":{"pin":"pinrailBotMinus_38","part":"breadboard"},"from":{"pin":"pinrailTopMinus_38","part":"breadboard"},"color":"#24272b"},{"id":"uno-wire-5","to":{"pin":"connector2","part":"servo"},"from":{"pin":"connector52","part":"uno"},"color":"#ed8831"}],"labels":[{"id":"callout-0","pin":null,"part":"servo","text":"Forward → stop → reverse"}]},"title":"Run, stop and reverse","easing":"ease-in-out","caption":"Set a modest speed in the App, then hold Run. Release to stop; move the slider to a negative value to reverse.","duration":16.312,"generated":true},{"at":0,"type":"scene","state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0}],"wires":[],"labels":[{"id":"callout-0","pin":null,"part":"uno","text":"Uno R3"},{"id":"callout-1","pin":null,"part":"breadboard","text":"830-contact breadboard"}]},"title":"Set up the 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workbench","camera":{"target":[0,5,25],"position":[92.0,189.0,203.25]},"easing":"ease-in-out","viewer":{"fillLight":0.3,"flowEnabled":false,"servoSpeeds":{"servo":0},"labelsVisible":false,"pressedButtons":[]},"caption":"","duration":0.8},{"at":17.2,"type":"scene","state":{"parts":[{"id":"breadboard","locked":true,"moduleId":"LBKit-breadboard-full","position":[-82.55,0,-27.305],"rotation":0},{"id":"uno","moduleId":"LBKit-arduino-uno","position":[-77,0,42],"rotation":0}],"wires":[{"id":"uno-wire-1","to":{"pin":"pinrailTopMinus_5","part":"breadboard"},"from":{"pin":"connector88","part":"uno"},"color":"#24272b","animation":{"in":1.5,"out":1,"inDelay":0.5,"outDelay":0}}],"labels":[{"id":"callout-0","pin":"connector88","part":"uno","text":"GND"},{"id":"callout-1","pin":"pinrailTopMinus_5","part":"breadboard","text":"Upper − · 5"}]},"title":"Prepare the 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