For you diehard 9v battery fans, here is what I thought was a decent review of the top two 9v batteries.
For you diehard 9v battery fans, here is what I thought was a decent review of the top two 9v batteries.
Yeah, that was one of the things that came to my mind. RIP Astron II launch controller. Long live Electron Beam... .Wow, no wonder they suck as launch controllers. 2.5 ohm internal resistance, and these are the *good* brands. Yikes. So they're maxing out at less than 4A current delivery when *new*.
I've done DD flights reliably with voltage down to 8.8V.I use Duracells. They have the internal cells with welded connections. Energizer relies on the case to hold the cells in contact. I've always used 9V batteries and replace when open circuit reaches 9.2V.
Yes, that is a plus. However, I also use Energizers, or even off-brands, always attached to the sled with the leads pointing down. That way, the acceleration force pushes the connections together at the bottom.I use Duracells. They have the internal cells with welded connections.
We did some research for a 9V battery format to power a home made flight computer with BMP280 altimeter, MPU-6050, ESP32 Microcontroller and more importantly ignite e-match for recovery and the only one we found that could provide continuous 1000mA in the 9v format was the Energizer Ultimate Lithium.
It is a bit pricey at about 15$ Canadian but for our need, the ratio power/weight (34 grams) was good at the time.
We did some research for a 9V battery format to power a home made flight computer with BMP280 altimeter, MPU-6050, ESP32 Microcontroller and more importantly ignite e-match for recovery and the only one we found that could provide continuous 1000mA in the 9v format was the Energizer Ultimate Lithium.
It is a bit pricey at about 15$ Canadian but for our need, the ratio power/weight (34 grams) was good at the time.
Welcome to the forum, what project was this for? It looks similar to some of the projects JBP has worked on.
Thank you Michael,
I have been silently following this community for the pas few months. I especially like (the now 24 pages) post "I could use just a little guidance" from Jim Jarvis
Regarding this project, we call it MORGAN (for MOdel Rocket Guidance And Navigation).
It is a hobby project started with a friend at the end of last year, which also serves as a cool way to spend time while confined at home. It is our first experience in the model rocketry world. We were strongly influenced by Joe Barnard (BPS.space) and the rocketryforum.com board.
The flight computer is our own design. It was built with the following requirements in mind:
The firmware is currently being fine tuned and we are finishing work on the front-end configuration/tuning Web-APP that can be used in the field on a cell phone or a laptop.
- Fast MCU, plenty of GPIO, Wifi & BLE, relatively low power (we chose the ESP-32 Microcontroller)
- Attitude stabilisation (Pitch/Yaw) using either canards fins and/or Thrust Vectoring Control (TVC) and soon, Reaction Wheel (for roll control).
- Up to 4 servos connections independently controlled using PID loops.
- Altitude / Apogee detection using BMP-280 and MPU-6050 for Gyro/Axcel.
- 4 pyros channels (using mosfets) for deployment of recovery systems and stage separation.
- Must be able to log as much information from the flight passible.
- On board 64Mb Flash memory + optional SD Card for data logging.
- Battery voltage monitoring (regulated from 7~12v down to 5v and 3.3v).
- GPS capability (not used yet)
- Bluetooth bi-directional communication for parameters configuration and pre-flight systems tests.
- And the all important flashing RGB Led and Piezzo Buzzer
We hope to be able to fly it by the end of this month after extensive ground tests. If we achieve a few successful low altitude flights, we would like to get certified by a local club to do more serious stuff.
Hi Stephen,
Jim and Joe are two great choices for inspiration. I seem to recall a thread a while back announcing this project or something similar. I am thrilled to see it come to fruition! I read the price in Canadian comment, so I am assuming you are in Canada, which province, which clubs?
We are in suburbs of Montreal, Quebec.
The only club that I am aware of in the province is : https://www.clubqf.ca/index.html which seems to be a division of the Canadian Association of Rocketry https://www.canadianrocketry.org/index.php
Unfortunately they do not have many events. The good thing is that we will have more time to be ready to launch at their next event (if we are allowed).
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