1/2/5pcs A3144 3144 Hall Effect Sensor, Supply 4.5V - 24V TO-92 for Arduino AU $1.80 to AU $2.00Save up to 15% when you buy more
MP2403 Ultra-small DC-DC Step-down Converter 3A adjustable - replaces MP1584 AU $4.00Save up to 15% when you buy more