Commit 5a92b269 authored by Bernd-Christian Renner's avatar Bernd-Christian Renner
Browse files

mc

parent b89830c2
......@@ -334,8 +334,8 @@ The evaluation script will only use 4 fixed gin configurations, the additional o
|3 | VREF | Reference voltage for op-amps | VANA / 2 => 2.5V |
|4 | VDD | Supply voltage | ~5.25V when RXEN high |
|5 | LP | Signal after 8th order bandpass filter | PRE2 * 1.5 (42kHz) |
|6 | SIG | Amplified signal for ADC | |
|7 | AMP | | LP * Gain (Poti) [1] |
|6 | SIG | ADC input (AMP plus buffer RC) | AMP |
|8 | VANA | Switched supply voltage | 5.0V when VDD power good |
[1] Gain in unconfigured state: x3
......@@ -345,12 +345,12 @@ If the bandpass filter is not working correctly, further points are available fo
![](/images/hardware_check/testpoints/rx_bp.png)
|Testpoint | Gain | Source |
| ----- | ---- | ---- |
|TB1 | 1.5 | PRE2 |
|TB2 | 1 | TB1 |
|TB3 | 1 (-5%) | TB2 |
|TB4 / LP | 1 (+5%) | TB3 |
|Testpoint | Gain | Source |
| ---- | ---- | ---- |
|TB1 | ca. 1.5 | PRE2 |
|TB2 | ca. 1 | TB1 |
|TB3 | ca. 1 (-5%) | TB2 |
|TB4 / LP | ca. 1 (+5%) | TB3 |
## MB
......
......@@ -5,6 +5,22 @@ This is the documentation of the ahoi acoustic modem. It includes a description
The hardware comprises a stack of three boards: a mainboard with a microcontroller (blue), a receiver (green), and a transmitter (red). All boards follow a trade-off between high integration to achieve a small overall footprint and easy assembly by hand. We rely on COTS components exclusively, which were easily sourceable at the time of development. Component lists are provided along with schematics.
###General properties
<center>
| Property | Value |
| --: | -:- |
| Dimensions (wlh) | 50 mm x 50 mm x 25 mm (stacked PCBs, w/o battery and cables) |
| Weight | 150 g |
| Frequency Band | 24 - 84 kHz (depending on configuration) |
| Bandwidth | 24 - 36 kHz (depending on configuration) |
| Data Rate | 250 - 4500 bit per second |
| Transmit Power | up to 5 W (down to 0.75 W) |
| Receive Power | ca. 260 mW |
| Range | 300 m shown in experiments (potentially more than 1 km) |
| Supply voltage | 12V (3S Li-ion Battery) / max. 13V |
</center>
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<table>
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......@@ -45,3 +61,4 @@ The hardware comprises a stack of three boards: a mainboard with a microcontroll
</tbody>
</table>
<br>
-->
......@@ -12,7 +12,7 @@ on Windows machines or the one that comes with your distribution on Linux.
For Ubuntu, run
```
sudo apt install python3
sudo apt install python3-pip optional
sudo apt install python3-pip # optional
```
For Windows (10), go to [https://www.python.org/downloads/windows/](https://www.python.org/downloads/windows/) and
download the latest stable release (e.g., Python 3.9.2 from Feb. 19, 2021).
......
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