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CCVV.eez-project
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CCVV.eez-project
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"code": "# Constant current, variable voltage\r\n\r\nfrom eez import scpi\r\nfrom utime import ticks_ms, ticks_diff\r\n\r\n# change the voltage\r\ndef adjust_voltage():\r\n global voltage, is_on\r\n value = scpi('DISP:INP? \"Enter Voltage\",NUMB,VOLT,0,40,0')\r\n if not value is None:\r\n voltage = value\r\n if is_on:\r\n scpi(\"VOLT \" + str(voltage))\r\n\r\n# change the current\r\ndef adjust_current():\r\n global current, is_on\r\n value = scpi('DISP:INP? \"Enter Current\",NUMB,AMPE,0,5,0')\r\n if not value is None:\r\n current = value\r\n if is_on:\r\n scpi(\"CURR \" + str(current))\r\n\r\n# change timer start value\r\ndef adjust_timer():\r\n global timer\r\n if not is_on:\r\n value = scpi('DISP:INP? \"Enter Seconds\",NUMB,SECO,0.0,60.0,0.0')\r\n if not value is None:\r\n timer = value\r\n\r\n# reset timer\r\ndef reset_timer():\r\n global countdown, timer\r\n countdown = timer\r\n \r\ndef start():\r\n global voltage, current, is_on, status_text, countdown, timer, use_timer, prev_tick\r\n scpi(\"INST CH1\")\r\n if not is_on:\r\n try:\r\n scpi(\"OUTP ON\")\r\n except:\r\n scpi('DISP:ERROR \"External voltage detected!\"')\r\n else:\r\n scpi(\"VOLT \" + str(voltage))\r\n scpi(\"CURR \" + str(current))\r\n is_on = True\r\n status_text = \"Stop\"\r\n if timer > 0.0:\r\n countdown = timer\r\n use_timer = True\r\n else:\r\n use_timer = False\r\n else:\r\n scpi(\"OUTP OFF\")\r\n is_on = False\r\n status_text = \"Start\"\r\n countdown = 0.0\r\n use_timer = False\r\n\r\ndef main():\r\n # defaults\r\n global voltage, current, is_on, status_text, timer, current_draw, countdown, use_timer, voltage_actual, timer_on\r\n voltage = 0.0\r\n voltage_actual = 0.0\r\n current = 0.0\r\n current_draw = 0.0\r\n timer = 0.0\r\n countdown = 0.0\r\n prev_tick = -5.1\r\n use_timer = False\r\n is_on = False\r\n timer_on = False\r\n status_text = \"Start\"\r\n \r\n # Save state and set in known (default) state. \r\n scpi(\"*SAV 10\")\r\n scpi(\"MEM:STATE:FREEZE ON\")\r\n scpi(\"*RST\")\r\n \r\n # From now on we always restore the state in case of an error. \r\n try:\r\n scpi(\"DISP:DIAL:OPEN \\\"Scripts/CCVV.res\\\"\" )\r\n scpi('INST CH1')\r\n while True:\r\n # main loop\r\n # update measurements\r\n if is_on:\r\n current_draw = float(scpi('MEAS:CURR? CH1'))\r\n voltage_actual = float(scpi('MEAS? CH1'))\r\n \r\n if current_draw > 0.001:\r\n timer_on = True\r\n else:\r\n timer_on = False\r\n reset_timer()\r\n \r\n if prev_tick > -5.0 and use_timer and timer_on:\r\n countdown -= ticks_diff(ticks_ms(), prev_tick) * 0.001\r\n prev_tick = ticks_ms()\r\n else:\r\n current_draw = 0.0\r\n voltage_actual = voltage\r\n prev_tick = -5.1\r\n timer_on = False\r\n \r\n # shut off if timer ends \r\n if is_on and countdown < 0.0:\r\n start()\r\n \r\n # update displays\r\n scpi('DISP:DIAL:DATA \"voltage\",FLOAT,VOLT,' + str(voltage))\r\n scpi('DISP:DIAL:DATA \"voltage_actual\",FLOAT,VOLT,' + str(voltage_actual))\r\n scpi('DISP:DIAL:DATA \"current\",FLOAT,AMPE,' + str(current))\r\n scpi('DISP:DIAL:DATA \"current_draw\",FLOAT,AMPE,' + str(current_draw))\r\n scpi('DISP:DIAL:DATA \"timer\",FLOAT,SECO,' + str(timer))\r\n scpi('DISP:DIAL:DATA \"countdown\",FLOAT,SECO,' + str(countdown))\r\n scpi('DISP:DIAL:DATA \"status_text\",STR,' + status_text)\r\n \r\n # parse actions\r\n action = scpi(\"DISP:DIALOG:ACTION? 0.1\")\r\n if action == \"adjust_voltage\":\r\n adjust_voltage()\r\n elif action == \"adjust_current\":\r\n adjust_current()\r\n elif action == \"adjust_timer\":\r\n adjust_timer()\r\n elif action == \"start\":\r\n start()\r\n elif action == \"reset_timer\":\r\n reset_timer()\r\n elif action == \"close_script\" or action == 0:\r\n break\r\n \r\n finally:\r\n # Turn off channels, etc.\r\n scpi(\"OUTP 0\")\r\n scpi(\"DISP:DIAL:CLOSE\")\r\n scpi(\"*RCL 10\")\r\n scpi(\"MEM:STATE:FREEZE OFF\")\r\n\r\nmain()\r\n"
},
"colors": [],
"themes": []
}