Copyright © Parallax Inc.
ELEV-8 Flight Controller (#80204)
v1.2 1/4/2017 Page 8 of 10
Receiver Headers
The receiver headers have 0.1” pin spacing oriented vertically. They provide 8 ports, each with 5 V
power, GND, and bi-directional communication with a Propeller I/O pin; see the Propeller I/O Pin
Assignments on page 9. These are typically connected to the channels on a standard RC receiver, such as
the Spektrum AR610 6-Channel Receiver (#80206) or the Spektrum AR8000 8-Channel DSMX Receiver
which is included with Spektrum’s DX7 Transmitter kit (#730-80300).
When configured for input, each I/O port is 5 V tolerant, and will typically sense high when the input
voltage reaches 1.65 V. In output mode, each I/O port can provide (source) up to 6mA of current, and
will typically be 3.3 V when high, and 0 V when low.
The receiver ports could also be re-purposed as additional ESC/AUX ports by modifying the open-source
Flight Controller firmware. The Receiver port signal pins are open; the Flight Controller does not have
pullup or pulldown resistors at these pins, so the user application is completely flexible to configure these
pins as required.
Reset Pad
This feature is only intended for use during advanced firmware development. Shorting together the reset
pads with a metal object, such as tweezers or a small screwdriver tip, will cause the Propeller to
immediately reload the code stored in EEPROM and re-start. If required, a push-to-make reset switch
could also be soldered to the exposed reset pads provided the cables were kept short (up to 5 cm).
SRR/DSM Header Pads
The SRR/DSM header pads are compatible with Spektrum brand remote receivers. The 3 pads are on
0.059" (1.50mm) pitch, and will accept a JST ZH series connector, such as part number: S3B-ZR(LF)(SN).
The pins definitions are as follows:
Pin
Cable Color (Typical)
Purpose
1
Orange
3.3VDC +/-5%, 20mA max
2
Black
GND
3
Gray
DATA (Connected to RCV port #1)
Pin 3 is the data pin, and is connected directly to the 1st receiver port. As such, do not use both RCV
port #1 and the SRR/DSM receiver at the same time.
The DSM type of receiver allows all of the receiver channels to be processed through the single RCV port
#1. This simplifies cabling and means that the other RCV ports (2-8) are free for customer custom
applications.
Accessory Power Header Pads
The accessory power header pads are provided as a convenience for custom applications only. Power is
provided from the onboard 3.3V LDO regulator which also powers the rest of the Flight Controller and
optional XBee module. Accordingly, it is not recommended to exceed 100mA load from the accessory
power header pads, to ensure enough power is available for the rest of the Flight Controller. The 3.3V
and GND pads will accept standard 0.1" spaced 2-pin headers.
