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projects:crazyflie:hardware:explained
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Table of Contents
Crazyflie KIT electonics explained
This section is there to explain all high level electronics used in the Crazyflie.
Electronics overview
Battery
The battery we use is of the type Li-Po (Lithium-Polymer). They are currently the most popular battery type for R/C use. The Li-Po is hoverer not the safest chemistry and should be handled with care. Failing to do so could make it catch on fire. It is also sensitive to under/over charge, to high discharge/shortage, heat and more. What it is good at however compensates for all these shortcomings as it has among the best power to weight ratios and discharge currents. So to handle some of the shortcomings we use a PCM (Protection Circuit Module) that will prevent the user from under/over chargeing or shorting it. The PCM is located under the orange tape on the top side of the battery where the wires come out.
The PCM has the following spec:
| Item | Specification | ||
| Overcharge detection voltage | 4.20±0.025V | ||
| Overcharge release voltage | 4.10±0.050V | ||
| Overcharge detection delay time | 0.92~1.38S | ||
| Over discharge detection voltage | 2.80±0.050V | ||
| Over discharge release voltage | 2.90±0.100V | ||
| Over discharge detection delay time | 115~173 ms | ||
| Over discharge current | 4～9A | ||
| Over discharge current delay time | 7.2～11ms | ||
| Short detection delay time | 220~380us | ||
| Short release condition | Cut of load | ||
| Current consumption | Max 0.7uA | ||
| Suggested max continuous charge/discharge current | 3A | ||
| Suggested operation temp | -20 - +60 deg C | ||
| Internal resistance | <60mOhm |
The LiPo used is the 671723HS25C from Fullriver.
| Model | Voltage(V） | Capacity(mAH) | Thickness(±0.2) | Width(±0.5) | Height(±0.5) | Weight(g） | Charge Rate | Continue Discharge Rate | Burst(≤5S） | ||||||||||||
| 671723HS25C | 3.7 | 170 | 6.9 | 17 | 23 | 3.9 | 1C-5C | 25C | ≥80% | 50C | |||||||||||
Power management
MCU
Sensors
Expansion header
2.4GHz radio
Motor drivers
Motors
projects/crazyflie/hardware/explained.1354543969.txt.gz · Last modified: 2015-07-15 16:30 (external edit)
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