/obj/machinery/atmospherics/binary/passive_gate
//Tries to achieve target pressure at output (like a normal pump) except
// Uses no power but can not transfer gases from a low pressure area to a high pressure area
icon = 'icons/obj/atmospherics/passive_gate.dmi'
icon_state = "intact_off"
name = "Passive gate"
desc = "A one-way air valve that does not require power"
var/on = 0
var/target_pressure = ONE_ATMOSPHERE
var/frequency = 0
var/id_tag = null
var/datum/radio_frequency/radio_connection
/obj/machinery/atmospherics/binary/passive_gate/update_icon()
if(stat & NOPOWER)
icon_state = "intact_off"
else if(node1 && node2)
icon_state = "intact_[on?("on"):("off")]"
..()
return
/obj/machinery/atmospherics/binary/passive_gate/process()
. = ..()
if(!on)
return
var/output_starting_pressure = air2.return_pressure()
var/input_starting_pressure = air1.return_pressure()
if(output_starting_pressure >= min(target_pressure,input_starting_pressure-10))
//No need to pump gas if target is already reached or input pressure is too low
//Need at least 10 KPa difference to overcome friction in the mechanism
return
//Calculate necessary moles to transfer using PV = nRT
if((air1.total_moles() > 0) && (air1.temperature>0))
var/pressure_delta = min(target_pressure - output_starting_pressure, (input_starting_pressure - output_starting_pressure)/2)
//Can not have a pressure delta that would cause output_pressure > input_pressure
var/transfer_moles = pressure_delta*air2.volume/(air1.temperature * R_IDEAL_GAS_EQUATION)
//Actually transfer the gas
var/datum/gas_mixture/removed = air1.remove(transfer_moles)
air2.merge(removed)
if(network1)
network1.update = 1
if(network2)
network2.update = 1
return 1
//Radio remote control
/obj/machinery/atmospherics/binary/passive_gate/proc/set_frequency(new_frequency)
radio_controller.remove_object(src, frequency)
frequency = new_frequency
if(frequency)
radio_connection = radio_controller.add_object(src, frequency, filter = RADIO_ATMOSIA)
/obj/machinery/atmospherics/binary/passive_gate/proc/broadcast_status()
if(!radio_connection)
return 0
var/datum/signal/signal = getFromPool(/datum/signal)
signal.transmission_method = 1 //radio signal
signal.source = src
signal.data = list(
"tag" = id_tag,
"device" = "AGP",
"power" = on,
"target_output" = target_pressure,
"sigtype" = "status"
)
radio_connection.post_signal(src, signal, filter = RADIO_ATMOSIA)
return 1
/obj/machinery/atmospherics/binary/passive_gate/interact(mob/user as mob)
var/dat = {"Power: [on?"On":"Off"]
Desirable output pressure:
[round(target_pressure,0.1)]kPa | Change
"}
user << browse("[src.name] control[dat]", "window=atmo_pump")
onclose(user, "atmo_pump")
/obj/machinery/atmospherics/binary/passive_gate/initialize()
..()
if(frequency)
set_frequency(frequency)
/obj/machinery/atmospherics/binary/passive_gate/receive_signal(datum/signal/signal)
if(!signal.data["tag"] || (signal.data["tag"] != id_tag) || (signal.data["sigtype"]!="command"))
return 0
var/old_on=on
if("power" in signal.data)
on = text2num(signal.data["power"])
if("power_toggle" in signal.data)
on = !on
if("set_output_pressure" in signal.data)
target_pressure = Clamp(text2num(signal.data["set_output_pressure"]), 0, ONE_ATMOSPHERE * 50)
if("status" in signal.data)
spawn(2)
broadcast_status()
return //do not update_icon
spawn(2)
broadcast_status()
update_icon()
if(old_on!=on)
investigation_log(I_ATMOS,"was powered [on ? "on" : "off"] by a remote signal")
return
/obj/machinery/atmospherics/binary/passive_gate/attack_hand(user as mob)
if(..())
return
src.add_fingerprint(usr)
if(!src.allowed(user))
user << "Access denied."
return
usr.set_machine(src)
interact(user)
return
/obj/machinery/atmospherics/binary/passive_gate/Topic(href,href_list)
if(..()) return
if(href_list["power"])
on = !on
investigation_log(I_ATMOS,"was turned [on ? "on" : "off"] by [key_name(usr)]")
if(href_list["set_press"])
var/new_pressure = input(usr,"Enter new output pressure (0-4500kPa)","Pressure control",src.target_pressure) as num
src.target_pressure = max(0, min(4500, new_pressure))
investigation_log(I_ATMOS,"was set to [target_pressure] kPa by [key_name(usr)]")
usr.set_machine(src)
src.update_icon()
src.updateUsrDialog()
return
/obj/machinery/atmospherics/binary/passive_gate/power_change()
..()
update_icon()