Connecting Lonestar to external hardware using the GPIO

Russell Parris -

Lonestar GPIO port pin-out and control notes

 Lonestar_GPIO_port.png

Pin

Label

Type

Details

1

P1.0

Digital in

Lonestar Trigger1

2

P1.1

Digital out

Continuous mode – high on red2

3

GPIO_0V

-

0V

4

GPIO_+5v

-

5V output2

5

A0_1

Analogue out

Lab User/Analyser mode – 0-5V scaled to 1st analyte concentration, if no analytes follows event_in_progress3

Continuous mode – follows event_in_progress3

6

P1.2

Digital out

Continuous mode – high on amber2

Lab User/Analyser mode – follows event_in_progress3

7

P1.3

Digital out

Continuous mode – high on green 2

8

AI_6

Analogue in

Available

9

AI_7

Analogue in

Not connected as standard

10

GPIO_GND

-

Ground

11

GPIO_GND

-

Ground

 

  1. The Lonestar trigger is used to synchronise the start of a DF matrix collection with an external input.  If the pin is left floating  (unconnected) then the matrix was be collected as normal; If held low at 0V upon pressing start the system will enter an “awaiting trigger mode”, the matrix will then start once a 5V signal is applied (trigger on rising edge).  The state of the pin when the matrix is complete will dictate whether it re-enters “awaiting trigger mode” or continues scanning  
  2. All outputs are limited to a 20mA draw.   A high power relay or similar should be used if a higher output is required.
  3.  Event_in_progress is a 5V digital output indicating whether the Lonestar is collecting data or not, it can be used to trigger external events (used to run stirrer on at line sampling module) or provide a timing pulse/trigger for external equipment.  By default it is low when off and high when sampling however this can be inverted using the National Instruments measurement and automation software included with the Lonestar by selecting channel amber and ticking the “Invert” radio button.      
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