00:00Need ultra-low power motion sensing on budget
00:02Found best deals for best BMA400 accelerometer sensor under $3.78
00:09Bench-tested options for wearable builds, battery life, raw accuracy
00:13First up, CJMCU 400 breakout board
00:18Costs $0.76
00:21High 5-star rating across 4,700 sales
00:24Best feature, dual SPI and I2C interface on pre-soldered test board
00:29Draws microamps, perfect for cheap wearable step counters
00:34Absolute winner under budget cap
00:37Second option, CJMCU 531 VL53L1X
00:42Priced $8.12
00:45Note, this is VL53L1X laser time-of-flight distance sensor, not BMA400 accelerometer
00:51Measures 400 cm
00:55Rating sits at 4.6 with 3,500 sales
00:58I only if project needs obstacle ranging instead of motion tracking
01:03Above target price, but solid ranging tool
01:06Third pick, CJMCU 400 SPI breakout
01:11Price is $5.37
01:14Over 3,000 units sold, 4.5 rating
01:18Best feature, dedicated SPI bus routing for stable high-speed reads
01:22Worth buying if primary sub-dollar listings vanish
01:26And reliable motion interrupts are required
01:28Fourth product, BMA400 3-axis module
01:33Costs $4.77
01:36Flawless 5-star score with 2,800 orders
01:39Key capability, low-noise acceleration profiling under ultra-low current draw
01:44Solid purchase for clean power budget balance on dev boards
01:49Fifth pick, original BMA400 LGA12 bare IC
01:53Costs $1.50
01:57Hits target budget easily with 5-star rating across 2,600 sales
02:01Standout feature, microscopic footprint for custom PCB surface mounting
02:07Best option for custom hardware runs requiring zero breakout board bulk
02:12Links to hardware placed in description below
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02:19Drop build questions in comments