Just so I am clear the circuit is shown in the position it would be in when the safety gate is closed and the rig is ready to fire (assuming the arduino has "armed" its pin).
Just so I am clear the circuit is shown in the position it would be in when the safety gate SWITCH is closed OFF and the rig is ready to fire (assuming the arduino has "armed" its pin)
What you are trying to say may be correct, but the way you are saying it is not.Just to be clear , the term "Safety" on control panels, implies the hardware is DISABLED, NOT READY TO FIRE, (ie: Safety switch OPEN, (not closed). When you put a handgun (or rifle) "Safety" in ON position, the weapon will not fire.If your switch is an SPST, you can use the term CLOSED. If the switch is an SPDT, you cannot use the term "closed" because the switch has two positions. You must therefore identify the switch position using the label of the functions for the two positions. Unfortunately, your schematic has no labels for the contacts of the safety switch. The only way we can identify it is the current path for Q1 base through the GREEN safety led would be "Safety OFF", because the unit is ready to fire. The other position would be "Safety ON" because the unit will not fire. Your understanding of the terminology is backwards.The above statement should read:FYI,Your use of the term "gate" with respect to this circuit is inappropriate. In electronics,a "gate" is a signal that is used as an Enable signal for some other signal.
Safety Interlock SwitchesOur Safety Interlock Switches are a means of safeguarding that monitors the position of a guard or gate. You can use them to shut off power, control personnel access and prevent a machine from starting when the guard is open.
An interlock is a device used to prevent undesired states in a state machine, which in a general sense can include any electrical, electronic, or mechanical device or system. In most applications an interlock is used to help prevent a machine from harming its operator or damaging itself by stopping the machine when tripped. Household microwave ovens are equipped with interlock switches which disable the magnetron if the door is opened. Similarly household washing machines will interrupt the spin cycle when the lid is open. Interlocks also serve as important safety devices in industrial settings, where they protect employees from devices such as robots, presses, and hammers. While interlocks can be something as sophisticated as curtains of infrared beams and photodetectors, they are often just switches.
Just so I am clear the circuit is shown in the position it would be in when the safety gate Guard is closed and the rig is ready to fire (assuming the arduino has "armed" its pin)
Huge machines in factories (like presses) use two switches that have to be pressed at the same time. They are physically at two different sites, so you cannot press the two switches with one hand at the same time. This makes sure that none of your hands can be within the press.
Nuclear missle launchers use two keys, but so what ? Where do you draw the line ? If the gate is closed and his thumb is on the Fire button, is it really possible for him to be in the path of the falling object released when he presses the fire button ?