So I'm working with a Parallax RFID card reader and a Parallax PIR sensor. They have details posted within the links but I bet the information on the packaging itself may be more accurate:
RFID reader: 5V (according to site: 4.5 to 5.5 V); 10 mA idle, 90 mA active
PIR sensor: 3 - 6 V; (according to site: "Source current up to 12 mA @ 3 V, 23 mA @ 5 V; 130 µA idle, 23 mA active (no load)")
I'm wondering how I can get these to work reliably on a single 9V battery. My understanding is that they will require approximately 7.5V minimum judging by the above information. Am I correct in assuming that some setup with a 9V battery will allow these to function?
Will it be enough to arrange them in parallel or will I need an additional resistor somewhere in the circuit? How can I determine a static setup that will allow everything to work? The part that leaves me unsure is the fact that the current consumption is variable depending on whether or not the devices are active.
I appreciate any help!
RFID reader: 5V (according to site: 4.5 to 5.5 V); 10 mA idle, 90 mA active
PIR sensor: 3 - 6 V; (according to site: "Source current up to 12 mA @ 3 V, 23 mA @ 5 V; 130 µA idle, 23 mA active (no load)")
I'm wondering how I can get these to work reliably on a single 9V battery. My understanding is that they will require approximately 7.5V minimum judging by the above information. Am I correct in assuming that some setup with a 9V battery will allow these to function?
Will it be enough to arrange them in parallel or will I need an additional resistor somewhere in the circuit? How can I determine a static setup that will allow everything to work? The part that leaves me unsure is the fact that the current consumption is variable depending on whether or not the devices are active.
I appreciate any help!