In addition to the circuit board itself, EasyMotor needs -a power switch and battery to operate. Unlike most other -Altus Metrum products, EasyMotor does not work with -single-cell LiPo batteries. That’s because commonly -available inexpensive pressure sensors need 5V, which is -more than a single-cell LiPo provides. Any battery that -provides from 6.5 to about 15 volts should work. Good -choices are the common 9V alkaline battery, or the very -small and light A23 12V alkaline batteries.
+a power switch and battery to operate. Like many Altus +Metrum products, EasyMotor requires a single-cell LiPo +battery, and has an on-board charging circuit. The 5V +needed for inexpensive pressure sensors is generated +onboard using a switching regulator to boost the voltage.Because he often mounts EasyMotor to the motor’s forward @@ -170,7 +167,8 @@ from 0.5V at 0 to 4.5V at the maximum pressure supported by the sensor. Very inexpensive sensors that have a â1/8 NPTâ threaded input, a âBuick-styleâ 3-pin connector, and typically ship with a short cable and mating -connector, are readily available on eBay and AliExpress.
+connector, are readily available through various vendors +including Amazon, eBay, and AliExpress.To log in-flight chamber pressure, a typical approach @@ -181,6 +179,12 @@ NPTâ pipe tap. Fill the touch hole with grease, screw in the pressure sensor, and attach the sensor leads to EasyMotor.
If you aren’t up for machining closures yourself, +Loki Research sells +54mm and 75mm "experimental bulkheads" with threaded +sensor ports that can be used with snap ring cases.
+After flight, AltosUI can be used to download the flight data, -then export it to a comma separated values (CSV) file. Such a -file can easily be loaded into a spreadsheet for analysis.
+view a quick graph of acceleration and pressure with pan and +zoom capabilities, then export it to a comma separated values +(CSV) file. Such a file can easily be loaded into a spreadsheet +for analysis.