{
  "format": "evn-blocks",
  "version": 1,
  "needs": "a motor on port 1 and something to block its shaft (your hand or an end stop).",
  "workspace": {
    "blocks": {
      "languageVersion": 0,
      "blocks": [
        {
          "type": "text_print",
          "inputs": {
            "TEXT": {
              "shadow": {
                "type": "text",
                "fields": {
                  "TEXT": "grab the shaft within the next 3 s ..."
                }
              }
            }
          },
          "x": 20,
          "y": 20,
          "next": {
            "block": {
              "type": "evn_wait",
              "inputs": {
                "TIME": {
                  "shadow": {
                    "type": "math_number",
                    "fields": {
                      "NUM": 3000
                    }
                  }
                }
              },
              "next": {
                "block": {
                  "type": "evn_motor_run_until_stalled",
                  "fields": {
                    "PORT": "1",
                    "THEN": "COAST"
                  },
                  "inputs": {
                    "SPEED": {
                      "shadow": {
                        "type": "math_number",
                        "fields": {
                          "NUM": 200
                        }
                      }
                    },
                    "DUTY": {
                      "shadow": {
                        "type": "math_number",
                        "fields": {
                          "NUM": 50
                        }
                      }
                    }
                  },
                  "next": {
                    "block": {
                      "type": "text_print",
                      "inputs": {
                        "TEXT": {
                          "block": {
                            "type": "text_join",
                            "extraState": {
                              "itemCount": 2
                            },
                            "inputs": {
                              "ADD0": {
                                "shadow": {
                                  "type": "text",
                                  "fields": {
                                    "TEXT": "stalled at "
                                  }
                                }
                              },
                              "ADD1": {
                                "block": {
                                  "type": "evn_motor_measure",
                                  "fields": {
                                    "PORT": "1",
                                    "WHAT": "angle"
                                  }
                                }
                              }
                            }
                          }
                        }
                      },
                      "next": {
                        "block": {
                          "type": "evn_wait",
                          "inputs": {
                            "TIME": {
                              "shadow": {
                                "type": "math_number",
                                "fields": {
                                  "NUM": 500
                                }
                              }
                            }
                          },
                          "next": {
                            "block": {
                              "type": "evn_motor_reset_angle",
                              "fields": {
                                "PORT": "1"
                              },
                              "inputs": {
                                "ANGLE": {
                                  "shadow": {
                                    "type": "math_number",
                                    "fields": {
                                      "NUM": 0
                                    }
                                  }
                                }
                              },
                              "next": {
                                "block": {
                                  "type": "evn_motor_run_target",
                                  "fields": {
                                    "PORT": "1",
                                    "THEN": "HOLD",
                                    "WAIT": "TRUE"
                                  },
                                  "inputs": {
                                    "ANGLE": {
                                      "shadow": {
                                        "type": "math_number",
                                        "fields": {
                                          "NUM": -90
                                        }
                                      }
                                    },
                                    "SPEED": {
                                      "shadow": {
                                        "type": "math_number",
                                        "fields": {
                                          "NUM": 300
                                        }
                                      }
                                    }
                                  },
                                  "next": {
                                    "block": {
                                      "type": "text_print",
                                      "inputs": {
                                        "TEXT": {
                                          "block": {
                                            "type": "text_join",
                                            "extraState": {
                                              "itemCount": 2
                                            },
                                            "inputs": {
                                              "ADD0": {
                                                "shadow": {
                                                  "type": "text",
                                                  "fields": {
                                                    "TEXT": "backed off to "
                                                  }
                                                }
                                              },
                                              "ADD1": {
                                                "block": {
                                                  "type": "evn_motor_measure",
                                                  "fields": {
                                                    "PORT": "1",
                                                    "WHAT": "angle"
                                                  }
                                                }
                                              }
                                            }
                                          }
                                        }
                                      },
                                      "next": {
                                        "block": {
                                          "type": "evn_motor_stop",
                                          "fields": {
                                            "ACTION": "stop",
                                            "PORT": "1"
                                          }
                                        }
                                      }
                                    }
                                  }
                                }
                              }
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      ]
    }
  }
}