diff --git a/.gitignore b/.gitignore
index 4c88b418a46a7390e55d68494774fdec0f767e66..123b4aeb460c165da3085e4f912741e20df12fe9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -144,3 +144,8 @@ cython_debug/
 # custom
 creds.py
 creds.json
+tmp/*
+!tmp/.gitkeep
+*.log
+log/*
+!log/.gitkeep
diff --git a/Makefile b/Makefile
index 8c613cd2285167d70ff8c28fedfa4d22848d3129..6e50c1fbec9a32fec0c50cdade3afd2e814ed1b8 100644
--- a/Makefile
+++ b/Makefile
@@ -8,5 +8,9 @@ darknet:
 
 default: darknet
 	$(MAKE) LIBSO=$(LIBSO) -C darknet
+	
+clean:
+	rm -rf ./tmp/*
+	rm ./log/*.log
 
-.PHONY: default darknet
+.PHONY: default darknet clean
diff --git a/README.md b/README.md
index f41979e081b658220547c68d932993c64e6b13e0..037c3c6bbd46dcffca927bcd52e4f0a93dd50607 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,7 @@ will ensure libdarknet.so be generated, which will be used in darknet.py.
 ## Before starting the system
 
 **Always calibrate the position before using!**  
+
 The purpose is to reset the zero positions of x, y, z axis. This step should be
 done manually first and then use the webapp, i.e., the user should push the
 grantry and z axis to the upper right corner. Check the [official
@@ -94,6 +95,11 @@ for how to use the web app to set zeros.
 
 ## How to run this system?
 
+There is a main entrypoint, callable using `python -m farmbot_yolo` for a
+complete workflow. By running it, you can make Farmbot automatically conduct the 
+whole process. The three modules can also be run separately, mostly for 
+debugging purpose.
+
 The software has three main modules:
 
 1. `move`: drive FarmBot to move, take photos, and open/close the gripper
@@ -101,32 +107,38 @@ The software has three main modules:
    bounding boxes
 3. `location`: input bounding boxes, transfer to real-world coordinate
 
-We also provide `main.py` as a wrapper for all the modules above. By running it,
-you can make Farmbot automatically conduct the whole process. The three modules
-can also be run separately, mostly for debugging purpose.
-
 First go to `farmbot_yolo` and `conda activate <env>` to run the following scripts.
-`<env>` is the same as the one you created in _Install, Compile_
+`<env>` is the same as the one you created in [Setup](#setup)
 
 ### Move Farmbot, take photos, and open/close the gripper
 
+TODO: Add the arguments.
+
+```bash
+python -m farmbot_yolo ...
+```
+
 ### YOLO detection
 
 All the arguments for file path are set to default.
 
 ```
-python farmbot_yolo.detect --dont_show --ext_output --save_labels --input ../img --weights ../weights/yolov3-vattenhallen_best.weights  --config_file ../cfg/yolov3-vattenhallen-test.cfg --data_file ../data/vattenhallen.data
+python -m farmbot_yolo.detect --ext_output --save_labels --input ../img --weights ../weights/yolov3-vattenhallen_best.weights  --config_file ../cfg/yolov3-vattenhallen-test.cfg --data_file ../data/vattenhallen.data
 ```
 
 ### Calculate location
 
 ```
-python farmbot_yolo.location -v -cam ../static/camera_no_distortion.mat -loc ../img/locations/ -a ../img/annotations -o ../static/distance.txt -l ../log/location.log
+python -m farmbot_yolo.location -v -cam ../static/camera_no_distortion.mat -loc ../img/locations/ -a ../img/annotations -o ../static/distance.txt -l ../log/location.log
 ```
 
 All the arguments has default values, which means they can be all omitted if you
 don't change the document tree structure.
 
-### Scan the bed and pick
+### Download pictures
 
-重新生成 requirement！！
+Pictures that are taken using the web ui or from the code can be downloaded using:
+
+```bash
+python -m farmbot_yolo.download
+```
diff --git a/log/.gitkeep b/log/.gitkeep
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git a/pyproject.toml b/pyproject.toml
index d4221ab736068c96608067d54e271d88386af3f0..a94d26e536f661a1ff4823056be02756669bb68f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,7 +14,7 @@ authors = [
 classifiers = [
     "Programming Language :: Python :: 3",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.7"
 dependencies = [
     "requests",
     "numpy",
diff --git a/src/farmbot_yolo/__init__.py b/src/farmbot_yolo/__init__.py
index e5e182d25dd041b7a6ade7e7367f6a642e15ea35..3a3c88204e07cb6468b026c3480fc9d1941f77b6 100644
--- a/src/farmbot_yolo/__init__.py
+++ b/src/farmbot_yolo/__init__.py
@@ -1,6 +1,8 @@
 from pathlib import Path
 
 HERE = Path(__file__).parent
-REPO = HERE.parent
+REPO = HERE.parent.parent
+TMPDIR = REPO / "tmp"
+LOGDIR = REPO / "log"
 
 CREDS_PATH = REPO / "creds.json"
diff --git a/tmp/.gitkeep b/tmp/.gitkeep
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391